1.Tet is the most important festival in Vietnam ( cấu trúc so sánh nhất )

2.They played tennis at 10.30 yesterday morning

-- Do có yesterday nên dùng quá khứ

3.We have khown each other since we were ten year

-- Do có since nên dùng hiện tại hoàn thành

4.You have to take your hat off when going inside the main worship area of the temple.

Xin hay nhất

1) Tet is the most important festival in Vietnam. (So sánh nhất)

2) They played tennis at 10.30 yesterday morning. (có yesterday dùng QKĐ)

3) We have known each other since we were ten years old. (có since dùng HTHT)

4) You have to take your hat off when going inside main worship area of the temple. (have to do sth: phải làm gì)