这几个英语题目怎么做啊?

by the time
was often made to
found me to be
has been away from
离开，退学

同义句转换,每空一词(一个括号代表一个空）
1. The train had left when I got the train station.
The train had left (as )(soon )(as ) I got to the train station.
2. My father often made me do a lot of homework at the weekends.
I (was ) (often ) ( made) ( to)do a lot of homework at the weekends.
3. Allan found that I was very generous.
Allan (found ) ( it) ( I) ( was) very generous.
4. The little boy left school a week ago.（请解释一下此处left是什么意思）
The little boy ( ) ( ) ( ) ( ) school for a week.

1 The train had left before the time I got to the station.
2 I was often made to do a lot of homework at the weekends.
3 Allan found me to be very generous.
4 The little boy has been away from school for a week. 此处的left 没有什么特殊含义吧。