English grammar worksheet focusing on simple past, simple present, and will-future tenses.

Task: Fill in the missing forms in the correct tense (simple past, simple present, or will-future). Watch out for signal words.

Here is the completed worksheet with explanations for each answer:

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#### a) Walter ________ (go) to school last week.
- Signal word: "last week" (past time)
- Tense: Simple Past
- Answer: went

Explanation: The verb "go" in the simple past tense is "went."

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#### b) Why ________ you always ________ (sleep) in front of the TV?
- Signal word: "always" (habitual action)
- Tense: Simple Present
- Answer: do, sleep

Explanation: For questions in the simple present tense, use "do/does + base form of the verb." Since the subject is "you," we use "do."

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#### c) What ________ you ________ (do) next year?
- Signal word: "next year" (future time)
- Tense: Will-Future
- Answer: will, do

Explanation: For future actions, use "will + base form of the verb."

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#### d) We ________ (not/celebrate) our anniversary in 2050.
- Signal word: "in 2050" (future time)
- Tense: Will-Future
- Answer: won't celebrate

Explanation: For negative future actions, use "won't + base form of the verb."

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#### e) Tom ________ (stay) at home on Mondays.
- Signal word: "on Mondays" (habitual action)
- Tense: Simple Present
- Answer: stays

Explanation: The verb "stay" in the simple present tense for the third person singular ("Tom") is "stays."

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#### f) Where ________ you often ________ (sit)?
- Signal word: "often" (habitual action)
- Tense: Simple Present
- Answer: do, sit

Explanation: For questions in the simple present tense, use "do/does + base form of the verb." Since the subject is "you," we use "do."

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#### g) How much money ________ your father ________ (earn) every month?
- Signal word: "every month" (habitual action)
- Tense: Simple Present
- Answer: does, earn

Explanation: For questions in the simple present tense, use "do/does + base form of the verb." Since the subject is "your father" (third person singular), we use "does."

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#### h) Yesterday we ________ (not/watch) birds.
- Signal word: "yesterday" (past time)
- Tense: Simple Past
- Answer: didn't watch

Explanation: For negative past actions, use "did not + base form of the verb."

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#### i) Where ________ you two days ago?
- Signal word: "two days ago" (past time)
- Tense: Simple Past
- Answer: were

Explanation: The verb "be" in the simple past tense for the second person plural ("you") is "were."

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#### j) Who ________ (stand) behind the curtains last night?
- Signal word: "last night" (past time)
- Tense: Simple Past
- Answer: stood

Explanation: The verb "stand" in the simple past tense is "stood."

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#### k) They rarely ________ (buy) some milk in the supermarket.
- Signal word: "rarely" (habitual action)
- Tense: Simple Present
- Answer: buy

Explanation: For the simple present tense, the verb remains in its base form for the third person plural ("they").

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#### l) When ________ you ________ (meet) your best friend the last time?
- Signal word: "the last time" (past time)
- Tense: Simple Past
- Answer: did, meet

Explanation: For questions in the simple past tense, use "did + base form of the verb."

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#### m) My classmate always ________ (read) books.
- Signal word: "always" (habitual action)
- Tense: Simple Present
- Answer: reads

Explanation: The verb "read" in the simple present tense for the third person singular ("my classmate") is "reads."

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#### n) What ________ you ________ (think), if your brother ________ (steal) your money?
- Signal word: Conditional sentence (hypothetical situation)
- Tense: Would + base form (for "think"), would + base form (for "steal")
- Answer: would, think, steals

Explanation: In conditional sentences, the main clause uses "would + base form," and the subordinate clause uses the simple present tense.

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#### o) Why ________ (be) you here now?
- Signal word: "now" (present time)
- Tense: Simple Present
- Answer: are

Explanation: The verb "be" in the simple present tense for the second person singular ("you") is "are."

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#### p) I ________ (not/hear) you because I was listening to music.
- Signal word: "was listening" (past continuous, indicating a past action)
- Tense: Simple Past
- Answer: didn't hear

Explanation: For negative past actions, use "did not + base form of the verb."

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#### q) We ________ (clean) your apartment after you had had a party there.
- Signal word: "after you had had a party" (past time)
- Tense: Simple Past
- Answer: cleaned

Explanation: The verb "clean" in the simple past tense is "cleaned."

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#### r) Last night we ________ (cannot/stand) the smoke.
- Signal word: "last night" (past time)
- Tense: Simple Past
- Answer: couldn't stand

Explanation: The verb "can" in the simple past tense is "could," and for negative actions, use "couldn't + base form of the verb."

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#### s) Why ________ you always ________ (talk) about me?
- Signal word: "always" (habitual action)
- Tense: Simple Present
- Answer: do, talk

Explanation: For questions in the simple present tense, use "do/does + base form of the verb." Since the subject is "you," we use "do."

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#### t) If you ________ (leave), I ________ (miss) you.
- Signal word: Conditional sentence (hypothetical situation)
- Tense: Would + base form (for "miss"), base form (for "leave")
- Answer: leave, will miss

Explanation: In conditional sentences, the main clause uses "will + base form," and the subordinate clause uses the base form of the verb.

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#### u) ________ (not/eat) during lessons.
- Signal word: No specific time indicator (general rule)
- Tense: Simple Present
- Answer: Don't eat

Explanation: For general rules or habits, use the simple present tense. Since the subject is implied as "you," we use "don't + base form of the verb."

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#### v) My sister ________ (water) the plants every day.
- Signal word: "every day" (habitual action)
- Tense: Simple Present
- Answer: waters

Explanation: The verb "water" in the simple present tense for the third person singular ("my sister") is "waters."

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#### w) Last Christmas I ________ (not/get) any presents.
- Signal word: "Last Christmas" (past time)
- Tense: Simple Past
- Answer: didn't get

Explanation: For negative past actions, use "did not + base form of the verb."

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#### x) In the evenings my parents ________ (not/play) cards.
- Signal word: "In the evenings" (habitual action)
- Tense: Simple Present
- Answer: don't play

Explanation: For negative habitual actions, use "do not + base form of the verb." Since the subject is "my parents" (plural), we use "don't."

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#### y) ________ I ________ (know) you? I haven't met you before.
- Signal word: No specific time indicator (current situation)
- Tense: Simple Present
- Answer: Do, know

Explanation: For questions in the simple present tense, use "do/does + base form of the verb." Since the subject is "I," we use "do."

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#### z) Please, ________ (help) me.
- Signal word: Request (immediate action)
- Tense: Simple Present (imperative mood)
- Answer: help

Explanation: In requests or commands, use the base form of the verb.

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Final Answer:

\boxed{
\begin{aligned}
&\text{a) went} \\
&\text{b) do, sleep} \\
&\text{c) will, do} \\
&\text{d) won't celebrate} \\
&\text{e) stays} \\
&\text{f) do, sit} \\
&\text{g) does, earn} \\
&\text{h) didn't watch} \\
&\text{i) were} \\
&\text{j) stood} \\
&\text{k) buy} \\
&\text{l) did, meet} \\
&\text{m) reads} \\
&\text{n) would, think, steals} \\
&\text{o) are} \\
&\text{p) didn't hear} \\
&\text{q) cleaned} \\
&\text{r) couldn't stand} \\
&\text{s) do, talk} \\
&\text{t) leave, will miss} \\
&\text{u) Don't eat} \\
&\text{v) waters} \\
&\text{w) didn't get} \\
&\text{x) don't play} \\
&\text{y) Do, know} \\
&\text{z) help}
\end{aligned}
}