2)在(刚)的时候。

On reaching the city he called up his parents.

一到城里他就给父母打了一个电话。

3.in

1)表示时段、时期在多数情况下可以和during互换前者强调对比后者强调持续。in(during)1988(December

the 20th century)在一九八八年(十二月、二十世纪)

七、动词：动词的四种时态：

(1)一般现在时：

一般现在时的构成

1.be动词：主语+be(am is are)+其它。如：I am a boy.我是一个男孩。

2.行为动词：主语+行为动词(+其它)。如：We study English.我们学习英语。

当主语为第三人称单数(he she it)时要在动词后加-s或-es。如：Mary likes Chinese.玛丽喜欢汉语。

动词+s的变化规则

1.一般情况下直接加-s如：cook-cooks milk-milks

2.以s._.sh.ch.o结尾加-es如：guess-guesses wash-washes watch-watches go-goes

3.以辅音字母+y结尾变y为i再加-es如：study-studies

(2)一般过去时：

动词过去式详解动词的过去式的构成规则有：

A、规则动词

①一般直接在动词的后面加ed：如worked learned cleaned visited

②以e结尾的动词直接加d：如lived danced used

③以辅音字母加y结尾的动词要改y为i再加ed(此类动词较少)如study studied carry carried worry

worried(注意play、stay不是辅音字母加y所以不属于此类)

④双写最后一个字母(此类动词较少)如stopped

B、不规则动词(此类词并无规则须熟记)小学阶段要记住以下动词的原形和过去式：sing sang eat ate

see saw have had do did go went take took buy bought get got read read

fly flew am/is was

are were say said leave left swim swam tell told draw drew e came lose

lost find found drink drank hurt hurt feel felt

(3)一般将来时：

基本结构：①be going to+do;

②will+do.be going to=will

I am going to go swimming tomorrow(明天).=I will go swimming tomorrow.

(4)现在进行时：amisare+动词现在分词

动词现在分词详解动词的ing形式的构成规则：

①一般的直接在后面加上ing如doing going working singing eating

②以e结尾的动词要先去e再加ing如having writing

③双写最后一个字母的(此类动词极少)有：running swimming sitting getting

第三部分：句法

1.陈述句