`2.` can (can `=` be able to: có khả năng)

`3.` be able to (chỉ khả năng nhất thời)

`4.` can't (can't chỉ khả năng không thể)

`5.` was able to (chỉ khả năng nhất thời, vế trước chia quá khứ `->` vế sau cũng quá khứ)

`6.` be able to (chỉ khả năng nhất thời, might + v-bare)

`7.` could/was able to (chỉ khả năng không thể/chỉ khả năng nhất thời, vế trước quá khứ `->` vế sau quá khứ)

`8.` couldn't (chỉ khả năng không thể, vế trước quá khứ `->` vế sau quá khứ)

$chucbanhoctot$
$\textit{~KaitoKid!}$

2. George has travelled a lot. He can four languages.

3. I used to be able to stand on my head but I can't do it now.

4. I'm afraid I can't/am not be able to come to the party tonight.

5. The computer went wrong, but luckily Emma was be able to/could put it right again.

6. Ask Catherine about your problem. She might be able to help you.

7.I learned to read music as a child. I could/ was be able to read it when i was 5.

8. Suddenly all the lights went out. We couln't see a thing.

*Cấu trúc be able to:

S+ to be (not)+able to+ Vnt

* Cấu trúc can: Có thể( Dùng trong thì hiện tại)

S+ can(not) + Vnt

*Cấu trúc could: có thể( DÙng trong thì quá khứ)

S+ could(not) + Vnt