can NOT leave out(省略)“that 1.出现两个或两个以上that引导的宾语从句并列结构，只有第一个 that可以省略 e.g.She tells me(that)the game is very good and that she wants to play it again. 2.从句的主语是this或者that e.g.Mom told me that this was a secret. 3.在that引导的从句中又包含有其他的从句 e.g.Research shows that if you smile everyday,you will live longer.can NOT leave out (省略) “that” 1. 出现两个或两个以上that引导的宾语从句并列结构，只有第一个 that可以省略 e.g. She tells me (that) the game is very good and that she wants to play it again. 2. 从句的主语是this或者that e.g. Mom told me that this was a secret. 3. 在that引导的从句中又包含有其他的从句 e.g. Research shows that if you smile everyday, you will live longer