Circle the correct words in bold. Then write what the words

Circle the correct words in bold. Then write what the words in each sentence express (ability in the present/ past/future, opportunity to do something, ability in a specific situation in the past).
1 You can / could use the computer now if you like. (.............)
2 in 100 years, we can / will be able to go on holiday in space. (............)
3 The computer is working again. Nurislam was able to / could fix it in half an hour. (.........)
4 You can / are able to go out with your friends if you finish your homework now. (...........)