161 Its a good idea for sb to do sth 对 来说是个好主意
162 Its important to sb 对某人来说很重要 eg： Its important to me
163 Its time to do sth Its time for sth 到了该去做某事的时间
eg ： Its time to have class Its 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？
167 keep out 不让 进入
168 keep sb adj 让保持 eg： I want to keep my mother happy keep healthy 保持健康
169 key to +名词 表示：某物的钥匙或某题的答案
170 key to anser to key 可以是答题或钥匙
161 Its a good idea for sb to do sth 对 来说是个好主意
162 Its important to sb 对某人来说很重要 eg： Its important to me
163 Its time to do sth Its time for sth 到了该去做某事的时间
eg ： Its time to have class Its 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？
167 keep out 不让 进入
168 keep sb adj 让保持 eg： I want to keep my mother happy keep healthy 保持健康
169 key to +名词 表示：某物的钥匙或某题的答案
170 key to anser to key 可以是答题或钥匙