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1、語態(tài)有兩種：主動語態(tài)和被動語態(tài)。

2、 主語是動作的發(fā)出者為主動語態(tài)；主語是動作的接受者為被動語態(tài)。

3、 1）若賓語補(bǔ)足語是不帶to 的不定式，變?yōu)楸粍诱Z態(tài) 時，該不定式前要加"to"。

4、此類動詞為感官動詞。

5、 feel, hear, help, listen to, look at, make, observe, see, notice, watch The teacher made me go out of the classroom. --> I was made to go out of the classroom (by the teacher). We saw him play football on the playground. --> He was seen to play football on the playground. 2）情態(tài)動詞+ be +過去分詞，構(gòu)成被動語態(tài)。

6、 Coal can be used to produce electricity for agriculture and industry.。

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