Helpful grammar guide and worksheet to help students practice using 'was' and 'were' correctly in past tense sentences.

Task Overview:

The worksheet focuses on the correct usage of "was" and "were" in sentences. The rules provided are:
- Was: Used with singular subjects (one person or thing).
- Were: Used with plural subjects (more than one person or thing).

Additionally, the worksheet provides contractions:
- Was not = wasn't
- Were not = weren't

Solution to Each Sentence:

#### 1. Sarah ________ at the doctor yesterday because she ________ sick.
- Sarah is a singular subject, so we use was.
- She is also a singular subject, so we use was.
- Completed sentence: Sarah was at the doctor yesterday because she was sick.

#### 2. I ________ in school last Thursday because it ________ a holiday.
- I is a singular subject, so we use was.
- It (referring to "last Thursday") is a singular subject, so we use was.
- Completed sentence: I was in school last Thursday because it was a holiday.

#### 3. They ________ excited because they ________ going to the cinema after school.
- They is a plural subject, so we use were.
- They is also a plural subject, so we use were.
- Completed sentence: They were excited because they were going to the cinema after school.

#### 4. We ________ able to answer the question because we didn't listen to our teacher.
- We is a plural subject, so we use were.
- Completed sentence: We were able to answer the question because we didn't listen to our teacher.

#### 5. Peter ________ upset because he forgot his mum's birthday.
- Peter is a singular subject, so we use was.
- Completed sentence: Peter was upset because he forgot his mum's birthday.

#### 6. My classmates ________ happy when I gave them some sweets.
- My classmates is a plural subject, so we use were.
- Completed sentence: My classmates were happy when I gave them some sweets.

#### 7. I ________ feeling well so I stayed in bed.
- I is a singular subject, so we use was.
- Completed sentence: I was feeling well so I stayed in bed.

Final Answers:

1. Sarah was at the doctor yesterday because she was sick.
2. I was in school last Thursday because it was a holiday.
3. They were excited because they were going to the cinema after school.
4. We were able to answer the question because we didn't listen to our teacher.
5. Peter was upset because he forgot his mum's birthday.
6. My classmates were happy when I gave them some sweets.
7. I was feeling well so I stayed in bed.

Explanation:

The key to solving these sentences is identifying whether the subject is singular or plural and then applying the appropriate form of the verb (was for singular, were for plural). This ensures grammatical correctness in each sentence.

Final Answer:
\boxed{
1. was, was \\
2. was, was \\
3. were, were \\
4. were \\
5. was \\
6. were \\
7. was
}