Question

hoàn thành câu thứ hai để nó có ý nghĩa tương tự câu thứ nhất

 1.I don't know anything about her background so I can't tell you.

 =>If I .................

 

Answer 1

->  If I knew anything about her background, I could tell you

Answer 2

know something about her background, I will tell you.

Answer 3

If I had known about her background, I would have told you

Answer 4

 If I knew anything about her background, I could tell you