名词性从句that从句和whether/if从句高频考点
一、that 从句
1、主语从句
（1）that从句作主语时，常用it作形式主语，常见的句型有：
It+be+形容词（obvious, true, natural, surprising,good,wonderful,funny,possible,likely,certain,probable,etc.）+that从句
It+be+名词词组（no wonder, an honor, a good thing, a pity, no surprise, etc.）+that从句
It+be+过去分词（said, reported, thought, expected, decided, announced, arranged, etc.）+that从句
（2）that可以省略，但that从句位于句首时，that不能省略。
2、宾语从句
（1）常见的可以接that从句作宾语的动词有see, say, know, imagine, discover, believe, tell, show, think, consider, be sure, be afraid等。在可以接复合宾语的动词之后，如think, make, consider等，可以用it作形式宾语。
（2）That从句一般不能充当介词宾语，偶尔可作except, in 的宾语。
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3、表语从句（that不可省略）4、同位语从句连词that引导同位语从句时，应在某些抽象名词之后，如：fact, hope, desire, thought, suggestion, idea, news, problem, possibility等，对前面的名词起补充说明的作用，that在从句中不担当任何成分，不能省略。二、whether/if从句1、在表语从句和同位语从句中只能用whether不能用if;当主语从句放于句首时，只能用whether不用if;当it作形式主语，主语从句放在句末时用whether或if均可；discuss后引导宾语从句时，必须用whether。2、在宾语从句中：（1）及物动词后：whether从句中不能有否定式，宾语从句为否定句时用if；if不能与or not连用，但可以用whether or not；whether后可以加不定式。（2）介词后：只能用whether,不用if。 1. “Shall we stop for lunch _____ shall we drive on?” “Let’s stop for lunch, but the driver can’t drink _____ drive.” A. and, and B. or, or C. and, or D. or,and 2. “_____ when does the pub stay open?” “About midnight.” A. Since...B. Before C. Until...D. After 3. “Would you like tea _____ coffee?” “_____, thanks.” A. or, No B. and, Either C. or, Neither D. and, Each 4. He imagines that people don’t like him, _____ they do. A. and B. then C. so D. but 5. I firmly believe _____ he said at the meeting was right. A. that B. which C. that what D. what that 【答案与解析】 1.【解析】选D，第一空填 or，表选择;第二空填 and，can’t drink and drive 指不能同时既喝酒又开车，即不能酒后开车。 2.【解析】选C，句意为“这家酒店开门到什么?(或这家酒店什么时候关门?)” 3. 【解析】选C，选项A用No来回答选择疑问句，不妥;选项B用 and 连接 tea 与 coffee，说明问句并非提供选择，而答语却用了 either 这样表选择性的词语，也不妥;选项D与语境不符。 4. 【解析】 选D，前后意思转折，故选 but.注：but they do = but they like him. 5【解析】选C，that 为引导宾语从句的连词，在 that what he said at the meeting was right 这一宾语从句中，又包含有what he said at the meeting 这一主语从句，而在该主语从句中，what用作动词 said 的宾语。
