一：现在进行时：
1、概念：用在叙述某人正在做某事的时候。（某动作正在进行）
其结构是“be动词 + 动词ing”,句中可能会有look，listen，now或一个相当具体的时间。
2、时间状语：now, at this time
3、基本结构：am/is/are+doing
4、否定形式：am/is/are+not+doing
5、一般疑问句：把be动词放于句首。
6、动词加“ing”（现在分词）的变化规则：
1）、直接在动词后面加“ing”
2）、“元音+辅音+e”结尾的单词把e去掉再加ing。
3）、重读闭音节双写最后字母再加ing，单词有：run—running、swim—swimming、put—putting、get—getting、shop—shopping
7、例句。what is mary doing? she’s shopping.
is betty swimming now? no, she isn’t. she’s running.
it’s seven thirty in the evening. we’re h**ing dinner at home.
二：一般现在时：
1、概念：经常、反**生的动作或行为及现在的某种状况。用来叙述经常性发生的事情、习惯和爱好等。
2.时间状语： always, usually, often, sometimes, every week (day, year, month…),once a week, on sundays,
3.基本结构：①动词原形（如主语为第三人称单数，动词上要加s或es）
4.否定形式：①此时态的谓语动词若为行为动词，则在其前加don't,如主语为第三人称单数，则用doesn't，同时还原行为动词； ②am/is/are+not。
5.一般疑问句：①若有be动词，把be动词放于句首；②用助动词do提问，如主语为第三人称单数，则用does，同时，还原行为动词。
6、如果叙述的人或事物是第三人称单数行为动词要加上，其变化规则和名词的复数形式变化规则一样。
1.) john likes going hiking.
2.) mary often gets up at seven o’clock.
3.) mr. li cooks supper every evening.
4.) how does he go to school? -he goes to school on foot.
5.) does he go to school on saturday? -yes, he does.
第三人称单数一般疑问句句前是does，句中的动词要用原形。)
动词第三人称单数变化规则（与名词的复数形式变化规则一样）:
1）直接在动词后面加“s”。
2）以“s、x、sh、ch”结尾的单词，在动词后面加“es”。
wash---washes watch---watches fish---fishes
3）以“辅音+y”结尾的单词，把y改i再加es。
carry---carries study---studies fly---flies
4）go 和do 的第三人称单数是goes 和does
叙述的人或事物不是第三人称单数行为动词要用原形。
7、例句。i usually go to school on foot.
we play football every sunday afternoon.
what do they do on sundays? -they play chess.
三：一般过去时：
1、概念：一般过去时表示过去某个时间发生的动作或存在的状态，常和表示过去的时间状态连用，
2.时间状语：ago, yesterday, the day before yesterday, last week(year, night, month…),in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc.
3.基本结构：
was/were +形容词； 例：i was a student in 1989
行为动词（动词原形变过去式）例：i played baskedball yesterday afternoon
4.否定形式：was/were+not；在行为动词前加didn't，同时还原行为动词。
5.一般疑问句：was或were放于句首；用助动词do的过去式did 提问，同时还原行为动词。
6. 动词过去式的变化：
规则动词的变化：
一般动词+ed 例：plant-planted,climb-climbed
以不发音的e结尾+d 例：like-liked
辅音字母加y结尾变y为i+ed 例：study-studied, cry-cried
重读闭音节单词，末尾只有一个辅音字母，双写最后一个字母+ed 例：stop-stopped，plan-planned
不规则动词的变化：
7.例句：she often came to help us in those days.
肯定句： i visited my grandparents last weekend.
i usually played with my friends last year.
i was busy last weekend.
they were sad yesterday.
否定句： i didn’t visit my grandparents last weekend.
i wasn’t busy last weekend.
they were not sad yesterday.
一般疑问句：
did you visit you grandparents last weekend? yes, i did. /no, i didn’t.
were you busy last weekend? yes, i was. /no, i was’t.
yes, we were. /no, we weren’t.
特殊疑问句：
what did you do yesterday? i played football.
where did mike go last weekend? he went to the library.
how did you go there? i went by bus.
where were you yesterday? i was at home.
四：一般将来时：
1、概念：叙述将要发生的事情或打算。表示将要发生的动作或存在的状态及打算、计划或准备做某事。
2.时间状语：tomorrow, next day(week, month, year…),soon, in a few minutes, by…,the day after tomorrow, etc.
3.基本结构：
am/is/are/going to + do；结构是be going to+动词原形。如果所接的动词原形刚好是go或come，可把to go 和to come 去掉。例：
i am going to go to school this afternoon= i am going to school this afternoon
will + do.
4.否定形式：①am/is/are/going to +not+ do；②will + not; 在行为动词前加will not，同时还原行为动词。
5.一般疑问句：be放于句首；will提到句首。
1.) what are you going to do tomorrow? -i am going to visit my grandparents.
what will you do tomorrow? -i will visit my grandparents.
2.) are they going to sweep the floor tonight? -yes, they are.
will they sweep the floor tonight? -yes, they will.
3.）where is sarah going (to go) next week? -she’s going (to go) the park.
where will sarah go next week? -she will go the park.
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