在SAT语法的试题中，我们尽量不要选择有被动语态的选项，但是下面的情况例外。
1.当我们不知道或者没有必要动作的实施者时。
如：the president was assassinated,
The house was built in 1990.
2.一些结构上的需要
When he came into the classroom, he was greeted by the teacher.
3.当下列动作的动作发出者是人时：
Report, believe, claim, estimate, find, know, assume
例：People widely believe the theory to be misleading
The theory is widely believed to be misleading
4.当未划线部分是被动语态，而划线部分应该与未划线部分构成平行结构，此时划线部分应该使用被动语态。
例：Mary is known as a writer while John is known as pianist.
在这个句子中，划线部分与while前面的部分构成平行结构，所以不宜改成John is a pianist.或者是people know John as a pianist.
例题1：
In some countries much of the food that is produced never comes to market because it is consumed locally or are exchanging for other goods.
(A) are exchanging
(B) exchange
(C) exchanged
(D) had exchanged
(E) were exchanging
答案：C
分析：连词or前后应该是平行结构，所以应该和or前面的is consumed被动时态保持一致。
例题2：
When we read, we first form innumerable impressions and then those impressions are evaluated as we read on.
(A) impressions and then those impressions are evaluated
(B) impressions and then evaluate those impressions
(C) impressions, evaluating those impressions then
(D) impressions, then we evaluate those impressions
(E) impressions, we evaluate those impressions then
答案：B
分析：句子当中出现了and这个连词，所以考虑平行结构，and后面的结构要和前面的we first form innumerable impressions保持一致。
以上内容就是小编为大家会做那个介绍的SAT语法中的动词语态考查方式，结合当中的例题希望对大家的SAT备考有帮助。
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