3 but no one has seen her since

3. but no one has seen her since. I have studied at this school since 1993. I entered this school in 1995. I have studied here since. He has lived in Beijing since he moved to the north three years ago.

4. It's not like her to have missed two days of classes. 一两天不来上课，她不是这样的人。 〖剖析〗It’s (just) like sb to do sth “ 某人（恰恰）就是这个样子”，表示表扬或 者不满，其否定式则表示怀疑。 It’s just like her to think of others before thinking of herself. It isn't like her to have spent so much money.

5. will +have + 过去分词是将来完成时 态，表示将来某个时刻已完成的动作。 By this time next year George will have taken his university degree. ▲will作情态动词用，作“一定会”；“ 想必”解。有时表示猜测。如： We will have done the job ahead of time if it doesn't rain.

6. in actual fact = in reality = as a matter of fact = actually 其实，事实上 I thought she was six, but in actual fact, she's only four.