Chia đúng dạng từ trong ngoặc

14. They …………………… (go) to America years ago, but none of them …………………... (come) back since then.
15. A: …………….. you ……………….. (speak) to an Englishman?B: Yes, I …………………….. (have) a short conversation with one last night.
16. A: ………………. you ever ………………….. (be) to Tatilya?B: Yes, I ………………………. (go) there two years ago.
17. A: ………………. you ……………….. (see) Jane recently?B: No, I ……………………………. (see) her for a long time