动词三单的变化规则.doc

文档介绍：动词三单的变化规则
,直接加-s,如:cook-cooks, milk-milks
. x. sh. ch. o结尾,加-es,如:guess-guesses, wash-washes, watch-watches, go-goes
“辅音字母+y”结尾,变y为i, 再加-es,如:study-studies
be动词的过去式为was, were;行为动词的过去式有规则变化和不规则变化两种,规则变化有以下几种情况:
1)直接在动词原形末尾加-ed. .
work-----worked; ask------asked;
2)以e结尾的动词只加-d. .
arrive-----arrived; like-----liked.
3)末尾只有一个辅音字母的重读闭音节,应先双写这个辅音字母,再加-ed. .
shop-----shopped;
4)以"辅音字母+y"结尾的动词,先把y变成i,再加-ed. .
carry----carried; study------studied.
有些动词变过去式是不规则的,.
fly------flew; break-----broke; teach-----taught. 这些需要像生单词一样记住.
现在分词的构成:
现在分词构成规则
例词
原形
现在分词
一般动词+ ing
work
visit
working
visiting
study
studying
以e结尾的动词,去掉e+ ing
come
live
leave
coming
living
leaving
以重读闭音节或r音节结尾的动词,末尾只有一个辅音字母的词,要双写这个辅音字母+ing
stop
begin
swim
get
refer
stopping
beginning
swimming
getting
referring
以ie结尾的重读开音节动词改ie为y+ing
die
tie
dying
tying