英語中的動詞有五種基本形式

：

原形 (do, write, think)

es

單數第三人稱形式 (do, write, think)

to

不定式 ( do, write, think) *'to' 有些情況下可省略

ing

現在分詞 (do, writ, think)

en, thought

過去分詞 (done, writt)

現在完成時的動詞構成：助動詞(have/has) + 動詞過去分詞形式（5),

比如：

have done

a) I it many times.

has written

b) She three books.

Have

c) you about it carefully?

所有的動詞都可以有現在完成時。

那什么時候需要用現在完成時？

就是當你想要表達到說話時為止，某個動作已經完成，并且你想強調這個動作對現在的影響。結合上面的例子說明：

have done

a) “I it many times.” 隱含的意思可能是 [So, I know how to do it. You don't need to teach me how to do it.]

has written

b) "She three books." 隱含的意思可能是 [She is great! She is working on another book now.]

Have

c) " you about it carefully?" 隱含的意思可能是 [If you haven't, then you probably should because this is an important matter.]

一般過去時

如果純粹想說到說話時為止，某個動作已經完成，不強調和現在的聯系，就可以用。比如：

did

e) I it.

wrote

f) She three books.

Did

g) you about it carefully?

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