2.shall用于一、三人称疑问句中表征询对方的意见。如:
----The room is so dirty. Shall we clean it?
----Of course.
1.表将来。通常不用于时间、条件的状语从句,而用一般现在时代替。但表意志的will是if所引导从句中的主语的意志、好意、主动等。 If you run, you may be in time. (跑步的话,你可能来得及。)
1.“延续性动词(肯定式)+until”表示“直到......才......”如:
He lived with his parents until he graduated from college.
He practiced running until he was tired out.
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