请教大家一个问题：
comment on the differences between the pair of sentences:
(1)They might not have tried before.
(2)They might have not tried before.
题目出现在语言学考试里，该从什么角度入手呢？
(1)They might not have tried before.一般来说情态动词后跟现在完成时表示对过去情况的推测。此句应理解为他们之前不可能尝试过。（这种推测的口气是极其不确定的）
(2)They might have not tried before.这句字面意思为：他们之前可能没有尝试过。
两句的主要区别在于not的侧重点不同，这种题型在专四的语法题中也偶尔会见到。
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