Question

He can/ is able to cook really well because he used to work in a restaurant. 2)To work for this airline you must can/must be able to speak English fluently. 3)I’m really sorry I couldn’t/ wasn’t able to come to your party last Saturday. 4)If it doesn’t rain, we can/ we’ll be able to go to the mountains tomorrow. 5)I’ve been so busy I haven’t could/ haven’t been able to call him yet. 6)I used to can/ used to be able to speak a bit of Russian but I’ve forgotten it now. 7)If we had a bit more money, we could/ would be able to buy a better car. 8)I hate not can/ not being able to tell my boss what I really think of him! 9)He could/ was able to talk whan he was only 18 months old. 10) Can you/ Will you be able to help me tomorrow? 11) I’ve never could/ never been able to dance very well. 12) To live in the country you need to can/ be able to drive.

Answer 1

He can/ is able to cook really well because he used to work in a restaurant.

2)To work for this airline you must can/must be able to speak English fluently.

3)I’m really sorry I couldn’t/ wasn’t able to come to your party last Saturday.

4)If it doesn’t rain, we can/ we’ll be able to go to the mountains tomorrow.

5)I’ve been so busy I haven’t could/ haven’t been able to call him yet.

6)I used to can/ used to be able to speak a bit of Russian but I’ve forgotten it now.

7)If we had a bit more money, we could/ would be able to buy a better car.

8)I hate not can/ not being able to tell my boss what I really think of him!

9)He could/ was able to talk whan he was only 18 months old.  - Здесь не ясно без форматирования. Если to стоит отдельно, то выбираем was able, так как to не употребляется после could.

10) Can you/ Will you be able to help me tomorrow?  - то же самое, если to не выделено тем же шрифтом что и will you be able, выбираем will you be able, в противном случае оба варианта правильны.  

11) I’ve never could/ never been able to dance very well.

12) To live in the country you need to can/ be able to drive.

Answer 2

1. He can/ is able to cook really well because he used to work in a restaurant.
2. To work for this airline, you must be able to speak English fluently.
3. I’m really sorry I couldn’t/ wasn’t able to come to your party last Saturday.
4. If it doesn’t rain, we'll be able to go to the mountains tomorrow.
5. I’ve been so busy I haven’t been able to call him yet.
6. I used to be able to speak a bit of Russian, but I’ve forgotten it now.
7. If we had a bit more money, we would be able to buy a better car.
8. I hate not being able to tell my boss what I really think of him!
9. He was able to talk when he was only 18 months old.
10. Can you help me tomorrow? / Will you be able to help me tomorrow?
11. I’ve never been able to dance very well.
12. To live in the country, you need to be able to drive.