主语与宾从之间有插入语时 It says, on the card, that it is made in China.
有多个并列宾从时,第一个可以省略,后面的不能 He said (that) the book was interesting and that many children like reading it.
当宾从主语是this,that或被this, that修饰时 The teacher said that(引导词) that word was wrong.
it做形式宾语,从句为真正主语时 I think it very important that we take part in the discussion.