思馬得英語100個(gè)句子學(xué)英語語法（29）：關(guān)于完成時(shí)態(tài)的注意點(diǎn)
<例句>
I won't believe you until I've seen you in the room with my own eyes.
我要親眼見到你在這個(gè)屋子里才相信你。
<語法分析>
在時(shí)間和條件狀語從句中，可用現(xiàn)在完成時(shí)態(tài)代替將來完成時(shí)。延續(xù)性動詞可用于現(xiàn)在完成時(shí)，可接表示段的時(shí)間狀語。非延續(xù)性動詞也可用于現(xiàn)在完成時(shí)，但不接表示段的時(shí)間狀語。有時(shí)在口語中，可用一般過去時(shí)代替現(xiàn)在完成時(shí)。有些動詞，如hope, plan, mean, expect和think等有時(shí)可用過去完成時(shí)來表示一個(gè)本來打算做而未做，曾經(jīng)設(shè)想而未實(shí)現(xiàn)的事情。在時(shí)間和條件狀語從句中，過去完成時(shí)可代替過去將來完成時(shí)。
<觸類旁通>
(1) He has got constant help from her since he has known her.
自從他認(rèn)識她以來，他一直得到她的幫助。
語法分析：為了強(qiáng)調(diào)從句謂語動詞從過去某一時(shí)刻開始，一直延續(xù)到現(xiàn)在，可用現(xiàn)在完成時(shí)態(tài)。
(2) I have never heard of her since she left.
自她離開后湖，我從未聽說過她。
語法分析：since從句如果用現(xiàn)在完成時(shí)，其謂語動詞一定是延續(xù)性的，如果是非延續(xù)性的，則只能用一般過去時(shí)。
(3) The vistors have stayed here for three days.
來訪者在這兒住了三天。
語法分析：延續(xù)性動詞可用于現(xiàn)在完成時(shí)，可接表示段的時(shí)間狀語。
(4) The young man has joined the Party.
這年輕人入了黨。
語法分析：非延續(xù)性動詞也可用于現(xiàn)在完成時(shí)，但不接表示段的時(shí)間狀語。
(5) I had intended to come over to see you, but was prevented from doing so.
我本打算來看望你，但受阻沒有來成。
語法分析：用過去完成時(shí)來表示一個(gè)本來打算做而未做，曾經(jīng)設(shè)想而未實(shí)現(xiàn)的事情。
(6) We would get into trouble as soon as the water had run out.
水一用完，我們就會陷入困境。
語法分析：在時(shí)間和條件狀語從句中，過去完成時(shí)可代替過去將來完成時(shí)。
<鞏固練習(xí)>
(1) When you _____[learn] computer, you'll find it a bridge to so much knowledge.
(2) The film _____[put] on at this cinema for three days.
(3) I _____[meet] him twice this morning.
(4) I _____[hear] of you before.
(5) This is the most wonderful film I ____[see}.
(6) In the last few years there _____[be] great changes in computers.
(7) She must _____[be] here last week.
(8) He should _____[let] us through the forest yesterday evening.
(9) The old man _____[live] here since 1980.
<參考答案>
(1) have learned (2) has been put (3) have met (4) have heard (5) have ever seen (6) have been (7) have seen (8) have let (9) has lived
