$1$. He has been learning since seven o'clock

$2$. The headmaster suspected that someone had broken the windows in the classroom

$3$. I have talked to Jim since we were at highschool

$4$. Having learned the lesson about global warming, we started to change our

@$Rinne$

#$Sếu$

WRITING: Rewrite the following sentence without changing its meaning.

1. He has been learning since seven o'clock. (have been doing sth: đã làm việc gì đó trong một thời gian dài)

2. The headmaster suspected that someone had broken the windows in the classroom.

3. I haven't talked to Jim since we were at highschool. (lần cuối nói chuyện là khi ở trường = chưa nói chuyện lại lần nào từ khi ở trường)

4. Having learned the lesson about global warming, we started to change our... (rút ngọn chủ ngữ vế đầu, vế sau phải là chủ ngữ của vế đầu)