161 It's a good idea for sb to do sth 对…… 来说是个好主意
162 It's important to sb 对某人来说很重要 eg: It's important to me
163 It's time to do sth It's time for sth 到了该去做某事的时间
eg : It's time to have class It's time for class 该去上课了
164 join = take part in 参加
165 just now 刚才
166 keep +sb /sth +adj /介词短语 让什么保持什么样?
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