http://www.tudou.com/v/ERocy2kjRT0

must 的用法

waveracetrackmile overtakespeedlimitdreamsigndriving licence chargedarling dear

be saving to you 现在进行时

where do ypu think you are?=do you thing where you are ?

on a race track.

you must have been driving at seventy miles an hour.对过去发生的事情的推测。

you must have been eating.

didn't you see the speed limit?你没看见限速牌吗？

that's why..... why 引导的从句

that's why i was late.

won't =will not

charge

【you'd better do take your teacher .你最好照老师的话去做。？？？】

must have done...can't have done....对过去发生的事情的推测

thanks