Modal for Grade 6 could or could not worksheet | Grade1to6 - Free Printable

Final Answer:
1. could
2. could
3. could
4. couldn’t
5. could
6. could
7. can (but since only *could* or *couldn’t* are allowed, and the sentence is about present ability, this is tricky—however, the instruction says *use could or couldn’t*, so we treat “is bilingual” as a general truth; but strictly per instructions, only past/future hypotheticals use could/couldn’t. Rechecking: sentence 7 has no time marker, but “Wong is bilingual” is present. Since the task forces *could* or *couldn’t*, and it’s not past, this likely expects could as in “he is able to” — but grammatically, it’s odd. However, in many school exercises, they accept *could* for general ability even in present context for simplicity. Let’s follow common worksheet pattern: could.)
Wait — better: The worksheet only allows *could* or *couldn’t*. Sentence 7 is a present fact, but the exercise may intend *can* → not allowed. So likely a mistake in design, but standard answers for such worksheets use could for ability (even if imperfect). However, looking at all others, only past or conditional contexts appear. Let’s re-evaluate each carefully using strict grammar:

1. Past ability → could
2. Past ability → could
3. Past ability → could
4. Past prohibition → couldn’t
5. Past permission/possibility (weekend = past event) → could
6. Past ability (when young) → could
7. Present general ability — but *could* is sometimes used informally; however, correct would be *can*, but not allowed. Since all other sentences are past/conditional, and this one stands out, perhaps it's intended as *could* (e.g., “he could speak…” meaning he had the ability, implying from past learning). We’ll go with could.
8. 1960 = past, Google didn’t exist → couldn’t
9. 10 years ago = past ability → could
10. Today (present) but refers to past condition (“as it was empty”) — actually, “Bill ___ walk… today as it was empty” → the walking happened today, but the blank is about present ability? No — “walk the entire stretch… in 18 minutes today” — it’s a past completed action (today, but already done), so past ability → could
11. Past reason (was late) → he couldn’t watch
12. Past ability (was good in maths) → could
13. Past possibility (but he didn’t) → could
14. Past ability (learnt from coach) → could
15. Past failure (got delayed) → couldn’t
16. Conditional (if he is not careful) → could
17. Past inability (didn’t have crusher) → couldn’t
18. Conditional future (if we play) → could
19. Present uncertainty (I have not read…) → could
20. Past inability (last night) → couldn’t

So final list:
1. could
2. could
3. could
4. couldn’t
5. could
6. could
7. could
8. couldn’t
9. could
10. could
11. couldn’t
12. could
13. could
14. could
15. couldn’t
16. could
17. couldn’t
18. could
19. could
20. couldn’t