引导词 连接词 (1)that无词义在从句中不作成分。并且that可以省略。 ①(2017·高考新课标全国卷Ⅱ)He came back in the late afternoon to discover that his suitcase was gone.
if/whether there was a John living there.
③We don’t know whether or not she was ready.
(2)whether,if意为“是否”在if和whether可互换后面直接跟or not时用whether不用if;作介词宾语时一般用whether。
连接代词 who等有词义在从句中作主语、宾语、表语、定语等。 ①(2017·高考新课标全国卷Ⅰ)Police have found what appears to be the lost ancient statue.whoever needs help a warm support.
连接副词 when等有词义在从句中作状语。 I don’t know wherere going to have the meeting.
要点归纳 (1)否定前移:主句的主语是第一人称单数谓语为think等时其后引导的宾语从句中若含有否定意义一般要把否定词移到主句谓语上从句谓语用肯定式。 ①I don’t think I know you.I don’t suppose he cares,does he?
(2)动词find等后有宾语补足语(形容词或名词)时需用it作形式宾语而将that宾语从句后置。 I think it necessary that we take plenty of boiled water every day.
(3)在finduppose,hate,like,owe...to,take...for granted等动词或动词短语和see to(表示“注意务必”)后有宾语补足语时需要用it作形式宾语而将宾语从句后置。 I hate it when they talk with their mouths full of food.
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