急!几道英语 词性转换!

急!几道英语 词性转换!
1.I______(go)to Beijing before an international meeting______(begin)in September.I______(invite)by CCTV recently.
2.Shanghai______(change)greatly in the past ao years.
3.Lost time______(never,find)again.
4.This kind of motorcycle______(not need)any fuel.
5.When______the leture______(begin)?
I don't komw yet.
6.You ______(want)on the phone,Miss Brown.
7.Why!My letter______(not.post)yet!