(1)一般现在时定义：表示经常性，习惯性的动作或存在的状态。标志词：频度副词 - always, usually, often, sometimes, every day等。结构：1.主语+be+名词/形容词I am a student.否
(1)一般现在时
定义：表示经常性，习惯性的动作或存在的状态。
标志词：频度副词 - always, usually, often, sometimes, every day等。
结构：
1.主语+be+名词/形容词
I am a student.
否定句：在be后加not
I am not a student.
疑问句：be提到句首
Are you a student？
2.主语+动词+其他
He goes to the park on Monday.
否定句：主语+don't/doesn't+动词原形+其他
He doesn't go to the park on Monday.
疑问句：在句首加上do或者does
Does he go to the park on Monday?
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. x. 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
定义：表示过去某个时间发生的动作或存在的状态。
标志词：过去时间 - yesterday, ago, last year等。
结构：
主语+动词过去式
He went to the market.
否定句：在动词前加didn't，动词恢复原形；在be后加not
He didn't go to the market.
疑问句：在句前加did，或将be提到句首
Did he go to the market?
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 , come–came , lose–lost ,
find–found , drink–drank , hurt–hurt , feel–felt
(3)一般将来时
定义：1.表示计划或打算做某事；2.将要发生的动作或存在的状态。
标志词：将来时间 - tomorrow, this afternoon, next week等。
结构：
1.主语+be going to+动词原形
She is going to ride a horse.
否定句：在be后加not
She is not going to ride a horse.
疑问句：将be提到句首
Is she going to ride a horse?
2.主语+will+动词原形
I will go to the library.
否定句：在will后加not，或缩写为won't
I will not go to the library.
疑问句：将will提到句首
Will you go to the library?
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
定义：表示目前正在发生的动作或存在的状态。
标志词：提示语 - look, listen, now等。
结构：
主语+be+现在分词+其他
They are reading English.
否定句：在be后加not
They are not reading English.
疑问句：将be提到句首
Are they reading English?
回答：Yes, they are./No, they aren't.
am,is,are+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 ,
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
