重点难点
现在完成时态
由“助动词have(has)+动词的过去分词”构成。当句子主语为第三人称单数时,助动词用has;其他人称用have。
(1)肯定句:主语+have(has)+动词过去分词+其他成份。如:
We have read the book already.
She has come.
(2)否定句:主语+have(has)+not+动词过去分词+其他成份。如:
I haven't seen the film.
(3)一般疑问句:Have(Has)+主语+动词过去分词+其他成份?
一般疑问句有肯定、否定两种回答,即肯定回答:Yes, …have. /Yes, …has.;否定回答:No, …haven't. /No,…hasn't.。如:
-Have you got an English-Chinesedictionary?
-Yes, I have. /-No, I haven't.
(4)规则动词的过去分词和过去式构成相同,都是在词尾加-ed。另一类是不规则的,大致分为以下几种类型:
1)AAA型(即动词过去式、过去分词与动词原形相同)。如:
原形 过去式 过去分词
cost cost cost
cut cut cut
2)ABB型(即动词过去式与过去分词相同)。如:
bring brought brought
buy bought bought
smell smelt smelt
smelled smelled
3)ABA型(即过去分词与原形相同)。如:
become became become
come came come
run ran run
4)AAA+en型。如:
beat beat beaten
5)ABA+n/en型。如:
fall fell fallen
show showed shown
throw threw thrown
6)ABB+n/en型。如:
speak spoke spoken
7)ABC型(即动词原形、过去式和过去分词各不相同)。如:
按动词所含字母排列规则:
*i→ a→ u
ring rang rung
sing sang sung
(5)情态动词(即情态动词只有原形及过去式两种形式)
1)AA型。如:
must must -
2)AB型。如:
can could -
may might -
shall should -
will would -
重点难点
现在完成时态
由“助动词have(has)+动词的过去分词”构成。当句子主语为第三人称单数时,助动词用has;其他人称用have。
(1)肯定句:主语+have(has)+动词过去分词+其他成份。如:
We have read the book already.
She has come.
(2)否定句:主语+have(has)+not+动词过去分词+其他成份。如:
I haven't seen the film.
(3)一般疑问句:Have(Has)+主语+动词过去分词+其他成份?
一般疑问句有肯定、否定两种回答,即肯定回答:Yes, …have. /Yes, …has.;否定回答:No, …haven't. /No,…hasn't.。如:
-Have you got an English-Chinesedictionary?
-Yes, I have. /-No, I haven't.
(4)规则动词的过去分词和过去式构成相同,都是在词尾加-ed。另一类是不规则的,大致分为以下几种类型:
1)AAA型(即动词过去式、过去分词与动词原形相同)。如:
原形 过去式 过去分词
cost cost cost
cut cut cut
2)ABB型(即动词过去式与过去分词相同)。如:
bring brought brought
buy bought bought
smell smelt smelt
smelled smelled
3)ABA型(即过去分词与原形相同)。如:
become became become
come came come
run ran run
4)AAA+en型。如:
beat beat beaten
5)ABA+n/en型。如:
fall fell fallen
show showed shown
throw threw thrown
6)ABB+n/en型。如:
speak spoke spoken
7)ABC型(即动词原形、过去式和过去分词各不相同)。如:
按动词所含字母排列规则:
*i→ a→ u
ring rang rung
sing sang sung
(5)情态动词(即情态动词只有原形及过去式两种形式)
1)AA型。如:
must must -
2)AB型。如:
can could -
may might -
shall should -
will would -