1 + 1 = 2

tchs mình tchs lại nha

chúc học giỏi Nguyễn Ngọc Bảo Anh

These workmen are never satisfied. They always (complain).

You (understand) the use of the present simple tense now?

Yes, I (do) an excercise on it at present and I (think) that I (understand) it now.

Kèm giải thích luôn nhé.