2020年高考英語系動詞及表語從句
a dictionary is a book which gives the meaning of words
結論: which在引導定語從句時,指事物,在從句中作主語或賓語,作賓語時常可省略
（四）當主句的主語為reason,或者是why由引導的從句時,與它們相關的表語從句用that來引導,而不能由because引導; because 引導表語從句時只能用于it/that/this is /was because…
句型中.如:
the reason why i was late was that i missed the train.
i was late. it/that/this was because i missed the train.
（五）whether在表語從句中表“是否”,但不充當句子的成分。if不能引導表語從句.如:
what the doctor really doubts is whether my mother will recover from the serious disease soon
（六）①as if 從句用陳述語氣的情況。 當說話者認為句子所述的是真實的或極有可能發生或存在的事實時。如： it sounds as if it is raining. 聽起來像是在下雨。 he talks as if he is drunk. 從他談話的樣子來看他是醉了。
②as if 從句用虛擬語氣的情況。 當說話人認為句子所述的是不真實的或極少有可能發生或存在的情況時。從句虛擬語氣動詞時態的形式如下：
（1）如果從句表示與現在事實相反，謂語動詞用一般過去時。
如： you look as if you didn’ t care. 你看上去好像并不在乎。
he talks as if he knew where she was. 他說話的樣子，好像他知道她在哪里似的。
（2）從句表示與過去事實相反，謂語動詞用“had＋過去分詞”。
如： he talks about rome as if he had been there before. 他說起羅馬來好像他以前去過羅馬似的。
the girl listened as if she had been turned to stone那女孩傾聽著，像已經變成了石頭似的。
（3）從句表示與將來事實相反，謂語動詞用“would/could/might＋動詞原形”。
如： he opened his mouth as if he would say something. 他張開嘴好像要說什么。
it looks as if it might snow. 看來好像要下雪了。
（七）使用虛擬語氣的表語從句
在表示建議、勸告、命令含義的名詞后的表語從句，謂語動詞需用“should+動詞原形” 表示，should可省略。常見的詞有：advice，suggestion，order，proposal，plan，idea等。
my suggestion is that we （should） start early tomorrow.
exercise
1. the question is ________ we will have our sports meet next week.
a. that b. if c. when d. whether
2.the reason why he failed is ________he was too careless.
a. because b. that c. for d. because of