Worksheet for practicing modal auxiliary verbs with fill-in-the-blank exercises.

Here’s the completed worksheet with explanations for each answer:

---

Modal Auxiliary Verbs (page 8)
*Modal auxiliary words are helping verbs (auxiliary verbs) that express necessity or possibility.*

---

✔ Completed Sentences:

1. You _can’t_ find an alligator this far north.
→ *Explanation:* This expresses impossibility — it’s not possible to find an alligator so far north (geographically unlikely). “Can’t” = cannot, indicating inability or impossibility.

2. Isabella _might_ miss her dance class because she has a solo in the show next week.
→ *Explanation:* This expresses possibility — there’s a chance she’ll miss class due to her performance. “Might” suggests uncertainty or potential.

3. Mike _should_ check his dog Lola for ticks since she was running around in the high grass.
→ *Explanation:* This expresses advice or obligation — it’s recommended or necessary for Mike to check his dog. “Should” is used for suggestions or what is right/wise to do.

4. Noah _must not_ swim in deep water where he can’t see the bottom.
→ *Wait — “must not” isn’t on the list!* Let’s check the options again.

❗️Important: The worksheet says “Choose a modal from the list above.” The list includes:
> can’t, mightn’t, would, should, ought to, won’t, shall not, may, might, mayn’t, could not, wouldn’t

“Must not” is NOT on the list. So we must choose from the given modals.

→ Best fit: Noah _should not_ swim in deep water...
OR — even better: Noah _ought not_ to swim... — but “ought not to” is a bit formal and less common.

However, looking at the list again — “shall not” and “will not” (won’t) are also options.

But “should not” is the most natural here — yet “should not” is not listed as one word; “should” is listed, and “not” is implied in context.

Actually — “should not” is acceptable, since “should” is on the list, and you’re forming “should not” by adding “not”.

Alternatively, “must not” is not allowed per instructions.

Let’s go with:
Noah _should not_ swim in deep water where he can’t see the bottom.

→ *Explanation:* Expresses strong advice or warning — it’s not safe, so he is advised against it. “Should not” = it is not advisable.

*(Note: If the teacher expects only single-word modals, “ought not to” is technically correct but awkward. “Should not” is most practical and commonly accepted.)*

5. The detective _would not_ believe the suspect would just blurt out, “I did it.”
→ Again, “would not” = “wouldn’t” — which IS on the list!

So: The detective _wouldn’t_ believe the suspect would just blurt out, “I did it.”

→ *Explanation:* Expresses unwillingness or disbelief — the detective refuses to believe such a thing. “Wouldn’t” = would not, indicating refusal or hypothetical disbelief.

6. The government _must_ protect its citizens from invasions.
→ Wait — “must” is NOT on the list! 😱

Again, we must pick from the provided list.

Closest match: The government _ought to_ protect its citizens from invasions.

→ *Explanation:* Expresses moral obligation or duty — it is right or necessary for the government to protect citizens. “Ought to” = should, but with stronger sense of duty.

Alternative: The government _should_ protect... — also acceptable, but “ought to” fits better for official duty.

---

📝 Final Answers (using ONLY modals from the list):

1. can’t
2. might
3. should
4. should not *(or “ought not to” — both use modals from list)*
→ Since “should” is on the list, and “not” is needed for meaning, “should not” is acceptable.
*(If forced to pick one word: “should” alone doesn’t work — must add “not” for negative meaning.)*
→ Better: “ought not to” — uses “ought to” from list + “not”

But let’s check: “ought to” is one entry. So “ought not to” is grammatically correct and uses a modal from the list.

So: Noah _ought not to_ swim...

5. wouldn’t
6. ought to

---

✔ Final Corrected Answers:

1. can’t
2. might
3. should
4. ought not to *(most accurate using list)*
5. wouldn’t
6. ought to

---

💡 Why these choices?

- Can’t = impossibility (geographical)
- Might = possibility (uncertain future event)
- Should = advice (health/safety precaution)
- Ought not to = moral/professional obligation to avoid danger
- Wouldn’t = refusal to believe (past habitual disbelief)
- Ought to = duty/responsibility (government’s role)

---

✔ All answers use modals strictly from the provided list.
📌 Tip: Always check if contractions like “wouldn’t” or “can’t” are included — they are, and they’re acceptable!

Let me know if you’d like a printable version or explanation for kids!