1) I'm leaving now because I don't want to miss the train (so)

=> I'm want to miss the train so I'm leaving now.......

2) The last time I saw my uncle was two years ago (for)

=> I haven't seen my uncle for 2 years.......

3) Let me reach my office and then I will talk to him (when)

=> I ..... will talk to him when I reach my office.........

4) Why don't we donate our old books, toys anh clothes to charity? (suggest)

=> Mom suggests donating our old books, toys and clothes to charity.....

5) Jane stayed behind after the class in order to talk to the teacher (because)

=> Jane stayed behind after the class because she wanted to talk to the teacher.......