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重点讲解：
1. need to do sth.
（为做成某事或正常生活）要求有，必须有，需要；
eg. I need to make a phone call.
我要打个电话。
eg. The method seems good but it needs to be tried out.
这个方法似乎不错，但需要试验一下。
2. It's time for sb. to do sth.
常用句型；表示“是该做某事的时候了”；
eg. It's time for us to enter into business talk.
是我们开始谈生意的时间了。
eg. John, it's time for you to hit the hay.
约翰，该去睡觉了。
