曼哈顿上一段关于现在完成时的知识点看不懂，求解答

xushi19911011 · 发表于 2012-7-25 11:26:36

Note that it is fine to write Veronica has traveled all over the world and omit any specific,
completed time reference. In this case, you are making a statement about Veronica today (the kind of person she is, her experience and qualities, etc.). Because of this emphasis on
the present time, the Present Perfect tends to work better in sentences with Simple Present
than in sentences with Simple Past or Past Perfect.
Finally, the idea of completed action can be used simply to place a Present Perfect action
earlier than another action in -Ing forms, infinitives or subordinate clauses.
Right: She WILL PAY you when you ASK her.
(the time of will pay = the time of [will] ask; note that the future will is
often dropped in subordinate clauses)
Right: She WILL PAY you when you HAVE TAKEN out the garbage.
(the time of will pay is LATER than the future time of have taken)

这是现在完成时知识点的最后几段话
这几段在讲什么？找了几个曼哈顿笔记好像都刻意的把这几段避开了

2013fallBiz · 发表于 2012-7-25 11:42:34

这里说的是当没有或省略since这样很明显的时间副词时完成时态的用法. 需要你通过发生动作的先后顺序来判断时态.

xushi19911011 · 发表于 2012-7-25 11:59:33

Finally, the idea of completed action can be used simply to place a Present Perfect action
earlier than another action in -Ing forms, infinitives or subordinate clauses.

能不能具体解释一下这句话表达的意思？

fanyue723 · 发表于 2012-8-25 16:53:41

刚开始也是不明白，看了二楼的解答有了一点想法。跟楼主分享一下。
我的理解是，在一个句子中如果有一个动作A是ing形式，不定式或者从句形式，那么另一个动作B用现在完成时态就表示B动作已经完成了，是一个completed action. 所以也就像二楼说的，可以用完成时态来看出一个句子中的动作先后。

个人理解，不知道对不对哈，希望能有NN指正~~~

曼哈顿上一段关于现在完成时的知识点看不懂，求解答

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