英语常用语法：时态一致

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英语常用语法：时态一致
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　　1)并列谓语的时态一致。
) H+ t4 |* C4 x　　【例如】Yesterday I went shopping, bought some books and had dinner at a good restaurant.
　　The soldier looked at him, exchanged glances with his comrade and took out the gun.
　　2)主从复合句的时态一致。
　　a)主句为现在时、将来时、现在完成时，宾语从句谓语动词时态按情况而定。
# w9 I9 c' b1 e. Y6 @  v4 ~  ^+ L　　【例如】
　　I wonder what will happen tomorrow.
* i5 Q: C' h: g* \4 T　　I wonder what happened to him yesterday.
  g. f0 i" F3 l0 r0 h& E　　I wonder what is happening now outside.
　　b)主句为过去时态，宾语从句一般用过去时态。如果宾语从句说明的是客观真理，用一般现在时。
　　【例如】
　　He told me he made a big mistake.
　　He told me he would go to Beijing the next day.
* g8 P3 U. _. Z5 J6 @! v4 |　　He told he had finished his task.
　　The teacher told students that the earth moves around the sun.(客观真理)
　　3)定语从句和比较状语从句时态不受主句影响。
0 c4 q  J) O/ o" i　　【例如】
　　The universityswhereshe is studying was founded in 1950.
3 Q3 ~  x# j6 U% W+ B　　You now speak English better than you spoke it last year.
2 s4 y) G5 _& g6 L5 g# O　　4)时间和条件状语从句中，常用现在时表示将来。
1 T7 |  J; \! W2 b　　【例如】
: g1 ^/ H7 y* k9 N4 p8 \- x4 |' L　　We will cancel our trip if it rains tomorrow.
* I& k" G) I: L　　I will go to visit the Summer Palace as soon as I arrive in Beijing.
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