一般過去時(shí)標(biāo)志：ago,yesterday,the day before yesterday,last year/month/night...，in 1989，just now?，F(xiàn)在完成時(shí)標(biāo)志：already,yet,just,before,recently,still,lately。

現(xiàn)在完成時(shí)的用法

1.表示過去發(fā)生并且已經(jīng)完成的動作對現(xiàn)在的影響及產(chǎn)生的結(jié)果

2.肯定句:主語+have+過去分詞、主語(第三人稱單數(shù))十has+過去分詞

3.否定句:主語+ have not+過去分詞、主語(第三人稱單數(shù))+ has not+過去分詞

4.疑問句:Have+主語十過去分詞、Has+主語(第三人稱單數(shù))+過去分詞

5.用法

[1]完成時(shí)的這種用法通常與由since或for引導(dǎo)的時(shí)間狀語連用。如：

The old man has lived here for more than twenty years.

老人已在此住了20多年了。

完成時(shí)的這種用法有時(shí)不帶時(shí)間狀語，有時(shí)可以和already，before，ever，just，lately，never，once，recently，yet等一些所指時(shí)間不具體的時(shí)間狀語連用。如：

Have you ever been to Australia? 你去過澳大利亞嗎？

[2] 有時(shí)完成時(shí)和now，today，this morning，this week，this year等的時(shí)間狀語連用。如：

I haven' t seen him today. 我今天沒見過他。

I have seen him only once this year. 我只見過他一次。

(3)完成時(shí)在時(shí)間和條件狀語從句中表示將來完成的動作

I'll go to the party as soon as (or when) I have finished my homework.

我完成作業(yè)后就去參加聚會。

(4)完成時(shí)和until now，so far，in the past few years，up to the present等表示從某時(shí)到這段時(shí)間的狀語連用 I have not heard from her so far. 到目前為止，我沒有收到過她的信。

We have learned five hundred words up to the present.到目前為止，我們已學(xué)了五百個生詞。