02_be动词、一般动词的现在式

be动词的现在式(am、are、is)

be动词的含义
是：We are happy.
是：She is happy.

主语+be动词
第一人称(I) + am = I am a boy.

第二人称(you)/复数名词 + are
例：You are my sons.

第三人称单数/单数名词+is
例：He is my students.

be动词的否定 = am/are/is not
肯定句：主语 + am/are/is
否定句：主语 + am/are/is not

例：He is a good baseball player.
否定句：He is not a good baseball player. = He isn't a good baseball player.

be动词的疑问句 = 将be动词放主词前，句尾加问号。

• 肯定句：主语 + am/are/is + 主词...？
• 疑问句：Am / Are / Is + 主语...?吗
  例：That is his camera. => Is that his camera?

The girl is a junior high school student.
疑问句：Is the girl a junior high school student?

be动词开头的疑问句，可用yes或no回答。

• 问句：Am/Are/Is + 主词
• 答句：Yes,主词 + am/are/is. No,主词+am/are/is+not
  例：Is that man your math teacher?
  答句：Yes,he is. /No,he is not.

Are you eating your lunch?
答句：Yes,I am. No,I am not.

一般动词的现在式

主词 + 一般动词 =>现在式中，主词为第三人称单数(他、她、它)，一般动词加s或es。
第一人称：I like dogs. / We like dogs.
第二人称：You like dogs. / You like dogs.
第三人称：He likes dogs. / They like dogs.

一般动词加s或es的方法

• 大部分动词加s，其发音为[s]或[z]。
  例：works、plays
• 一般动词字尾为o、s、sh、ch时，加es。
  例：goes、washes、watches
• 一般动词词尾为子音加y时，须去y再加ies。
  例：cry-cries、stuy-studies
• have和has(有、吃)的单数名词为has。
  例：They have a lot of money. He has a lot of moeny.

一般动词的否定句 =>不可在一般动词后加not，需要加助动词do或does。

• do->用于主词为I、you、复数。
• does->用于主词为第三人称单数。

肯定句：主词 + 一般动词
否定句：主词 + do/does + not + 动词原型

例：
The twin brothers go to scholl by bus.
否定句：The twin brothers do not go to school by bus. = The twin brothers don't go to school by bus.

Sam has dinner at the restaurant.
否定句：Sam does not dinner at the restaurant. = Sam doesn't dinner at the restaurant.

比较->否定句
be动词：

• He is my boyfriend.
• He isn't my boyfriend.

一般动词：
He likes dogs.
He doesn't like dogs.

一般动词的疑问句

含有一般动词的肯定句变为疑问句时，不可将一般动词拿到主词前，必须使用助动词do或does。而do或does之后，必须出现原型动词。

肯定句：主词 + 一般动词
疑问句：Do/Does + 主词 + 原形动词...？

You visit your grandmother on Sundays.
疑问句：Do you visit your grandmother on Sundays?

He comes from England.
疑问句：Does he come from England?

助动词do或does开头的疑问句，Yes或No之后，也必须用do或does做简答。

Does the little boy go to school?
答句：Yes,he does. /No,he doesn't.

比较->疑问句
be动词
She is beautiful.
Is she beautiful?Yes,she is.

一般动词

• She loves tennis.
• Does she love tennis?Yes,she does.