第十一讲 复 合 句
一、名词性从句考点透析
1．that无词义，在从句中不作成分。当that引导主语从句、表语从句、同位语从句时，that不能省。例如：
(1)That he will refuse the offer is impossi ble.
(2)It worried her a bit that her hair was turning grey.
2．whether，if都可引导名词性从句，但需注意下列几点：
(1)在句首引导主语从句时，只能用whether。
Whether we'll go camping tomorrow depends on the weather.
(2)if不能引导表语从句。
What the doctors really doubt is whether my mother will recover from the serious disease soon.
(3)if不能引导介词后的宾语从句。
Everything depends on whether we can make a plan that they will agree to.
(4)如果宾语从句是否定句时，只能用if。
I asked Pave if he hadn't decided what he would say at the meeting.
(5)discuss后的宾语从句只能用whether引导。doubt作“怀疑”解、后接宾语从句时，如果主句是肯定的，宾语从句用whether或if引导，如果主句是否定的，宾语从句只能用that引导。例如：
(1)We discussed whether the medicine will cause side effect.
(2)I doubt whether/if he is fit for his office.
(3)I don't doubt that he can do it very well.
3．wh词既有词义(该词基本的词汇意义)，又在名词性从句中充当成分。因此，在选择wh词时，既要考虑该词的基本意义，又要考虑它在从句中的作用。例如：
(1)－I drove to Zhuhai for the air show last week.
