be动词、一般动词和助动词
一、be动词、一般动词的现在式
（1）be动词的现在式—am/are/is
a.是（表状态）
We are happy.—我们很高兴
b.在（表存在）
She is in America.—她在美国
含be动词（am/are/is）的肯定句变成否定句时，在be动词后加not即可。
肯定句：主语+am/are/is…
否定句：主语+am/are/is+not…
He is a good baseball player.
他是一个好棒球员
（否定句）He is not a good baseball player.
= He’s not a good baseball player.
= He isn’t a good baseball player.
含be动词（am/are/is）的肯定句变成疑问句时，将be动词拿到主语前，句尾加？即可。肯定句：主语+am/are/is…
疑问句：Am/Are/Is+主语…？
1.That is his camera.
那是他的相机
（疑问句）Is that his camera?
2.The girl is a junior high school student.
那女孩是初中生
（疑问句）Is the girl a junior high school student?
动词开头的疑问句为一般疑问句，可用yes或no回答，而答句中的主语
（问句）Am/Are/Is+主语…？
（答句）Yes,主语+am/are/is
No,主语+am/are/is not
1.Is that man your math teacher?
Yes, he is./No,he is not.
2.Are you eating your lunch?
Yes, I am./No, I’m not.
（2）一般动词的现在式
凡是日常生活中具体的动作，如：eat-吃饭，walk-走路及抽象的动作如：like-喜欢，think-思考…皆为一般动词
a.大部分动词加s
works/plays
b.一般动词词尾为o/s/sh/ch时。加es
go-goes/wash-washes/watch-watches
c.一般动词词尾为字音+y时，去y加ies
cry-cries/study-studies
have和has
has为have（有，吃）的单数形式
They have a lot of money.
He has a lot of money.
含有一般动词从肯定句变为否定句时，不可直接在一般动词之后加not，必须使用助动词do/does/did。且助动词之后用原形动词，因为助动词表示了时态、数的变化。
do—用于主语为I/you/复数
does—用于主语为第三人称单数she/he
did—用于过去式，不分人称和数均可用
肯定句：主语+一般动词…
否定句：主语+do/does/did+not+原形动词
1.The twin brothers go to school by bus.
这对双胞胎兄弟坐公交车上学
（否定句）The twin brothers do not（=don’t）go to school by bus.
2.Sam has dinner at the restaurant.
（否定句）Sam does not（=doesn’t）have dinner at the restaurant.
否定句
a.be动词
He is my boyfriend.
He is not my boyfriend.
b.一般动词
He likes dogs.
He does not like dogs.
含有一般动词的肯定句变成疑问句时，不可将一般动词拿到主语前，必须用助动词do/does/did，且助动词之后用原形动词。
肯定句：主语+一般动词…
疑问句：Do/Does/Did+主语+原形动词…？
1.You visit your grandmother on Sundays.
（疑问句）Do you visit your grandmother on Sundays?
2.He comes from England.
（疑问句）Does he come from England?
do/does/did开头的疑问句（即一般疑问句），其回答
（问句）Do/Does/Did+主语+原形动词…？
（答句）Yes,主语+do/does/did
No,主语+don’t/doesn’t/didn’t
Does the little boy go to school?
Yes,he does./No,he doesn’t.
比较疑问句
a.be动词
She is beautiful.
Is she beautiful? Yes, she is.
b.一般动词
She loves tennis.
Does she love tennis? Yes,she does.
二、be动词、一般动词的过去式
Be动词的过去式
表示：过去时间中发生的状态
1.（现在式）He is busy now.（他现在很忙）
（过去式）He was busy then.（他那时很忙）
2.（现在式）My parents are at home now.
（过去式）My parents were at home yesterday.
时间副词改变，动词也应改变。
was和were
现在式过去式
be动词am
is
are
was
were
be动词过去式的否定句
含be动词过去式was/were的肯定句边否定句时，在be动词后加not.肯定句：主语+was/were
否定句：主语+was/were+not…
1.Mr.Brown was a vet.
Brown先生是一个兽医
（否定句）Mr.Brown was not（=wasn’t）a vet.
