强调句（二）
现将其用法归纳如下。
1. 强调句型中，能够被强调的句子成分通常为主语、状语、宾语等，不能用来强调谓语动词、表语、补语、让步状语、条件状语等。
例如 it was in the park that i mat my old teacher yesterday. (强调地点状语)
2． 强调句型中，连接词一般用that，如被强调的部分是人，也可用who/whom，其他一律用that，不能用which, where, when等，即使被强调的是物、时间状语或地点状语。
例如 it was at the gate that we met the inspectors this morning.
it is our head-teacher that/ who/whom we often turn to for help.
3． 强调结构中，无论被强调的是人还是物，单数还是复数，be动词一律用单数is/was形式，如果原句的谓语动词是一般过去时，就用was; 是一般现在时，就用is。也可以用"情态动词＋be"形式。
例如 it was the farmers that lived a hard life before liberation.
it might be yesterday that john bought a book for mary.
6. 当强调的是主语时，其谓语动词应和被强调的人和物保持人称、数的一致。如果被强调的主语是人称代词，宜用主格，间或也可用宾格。
例如 it is i who am going to attend the meeting.
it was i/me who cleaned the classroom.
7. 强调句型最容易与定语从句、主语从句和状语从句一起考查，应是学习和复习的重点。一般说来，如果把句子中的it is/ was … that去掉，稍加调整语序，能还原成完整句子，并且句子意思依然完整，则为强调句型；否则，应为其他句式。
例如 it was a small house that i used to live in. (定语从句)
it was at the school gate that i met an old friend of mine.（强调句型）
8、强调主语用人称代词主格，强调宾语用宾格。
it was i who g**e you the book.(不用me)
it was i not him who am your best friend.(谓语与被强调词保持主谓一致)
9、如果被强调的成分有同位语，同位语也应提前。
it was from him, our english teacher, that we learned this english song.我们从英语老师那学会了这首歌。
10、与其他一些句型结构的区别。
1）与状语从句的区别。
it was at 7 o’clock that i arrived. （强调句型，强调时间状语at 7 o’clock ）
it was 7 o’clock when i arrived. (when时间状语从句。在7 o’clock前无介词at.)
it is three years since he came here. 自从他来这已经三年了。
it was not long before the fire was put out. 不久大火就被扑灭了。
2）与主语从句的区别。
it is true that he is honest. 他真的很诚实。
it is known to all that china is a country with a long history. 众所周知，中国是一个历史悠久的国家。
3）与there be 句型的区别。
there is no possibility that bob can win the first prize in the match..鲍勃没有可能在比赛中获得一等奖。
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