被动语态：1.This work must be _____(finsh) before ten o'clock.finshed
2.The house needs to be _____(repair).
repaired
3.No one likes being _____ (laugh)at in public.
laughed
时态：1.He ___(be) a worker for ten years,but he ___(be) a lawer now.
was is
2.--Has he finished his homework
--I don't know .He ___(do) his homework this morning.
was doing
3.It's the first time that I ___(come) to the Great wall.
have come
4.The train ___(go) when I got to the bus station.
had gone
动词+ to do :learn plan decide offer demand dare promise agree hope wish expect help pretend manage try refuse want choose determine (这些都是直接在后面加to do 的,不加sb 之类的）
动词+doing :enjoy consider avoid escape stop risk admit understand mind imagine delay require finish suggest advise continue practise excuse
（鉴于太多了,例子就不举了,你只要照着那用法.例子应该不难的）
补充：他们24小时没睡觉.现在完成时是要对现在有影响或者延续到现在的,那是发生过了的,所以用过去完成时.
