一般疑问句和动词三人称单数1

一般疑问句和动词三人称单数1

动词第三人称单数形式

动词第三人称单数形式一般现在时的肯定句中，主语为第三人称单数的动词变化主要体现在词尾的变化上，其规律大体有三点：

1. 一般情况下，直接在动词词尾+s ，例如：get→gets;take→takes

2. 以s, sh, ch, x, o 结尾的动词，在词尾+ es，

例如：teach→ teaches; fix→fixes;go→goes

3. 以辅音字母+ y 结尾的动词，变y 为i，再+ es，如：study→ studies; try→tries 除上述规律外，还应注意下面:

动词 have ，遇到主语是第三人称单数时，要用 has；动词 be 的第三人称单数形式是is。

be动词包括：am， is， are。第三人称单数用 is；过去式为 was；复数用are，过去式为were.

在一般现在时中，当主语是第三人称单数时，谓语动词要用第三人称单数形式，即常在动词原形后加-s或-es。

第三人称单数:

一、人称代词he, she, it是第三人称单数。

如：He likes watching TV.

She has lunch at twelve.

It looks like a cat.

二、单个人名、地名或称呼作主语；是第三人称单数。如：

①Han Mei looks like her mother.

②Beijing is in China.

③Uncle Wang often makes cakes.

三、单数可数名词或"this / that / the+单数可数名词"作主语时，是第三人称单数。如：①A horse is a useful animal.

②This book is yours.

③That car is red.

④The cat is Lucy's.

四、不定代词someone, somebody, nobody, everything, something等及指示代词this, that作主语时，是第三人称单数。

如：①Everyone is here.

②There is something wrong with the watch.

③This is a pen.

④That is an eraser.

五、不可数名词作主语时为第三人称单数。

如：①The milk is in the glass.

②The bread is very small.

一般现在时

A.定义：表示经常性的事情，经常性的动作或一般性事实。

时间状语：often 经常，usually通常，always 总是，every每个，sometimes 有时，at …在几点钟

只有在第三人称单数用动词的“三单变化”，其他用动词的原形。

三单变化：

（1）直接在动词词尾加-s.

如：ask---asks work---works get---gets stay---stays

（2）以字母s, x, ch, sh或o结尾的动词，在词尾直接加-es.

如：watch---watches wish---wishes fix---fixes do---does go---goes pass---passes

（3）以“辅音字母加- y”结尾的动词，要先变y为i再加-es.

如：try---tries study---studies cry---cries fly---flies

(4)不规则变化：be---- is are have----has

B.一般现在时用法

（1）表示经常性，习惯性,永久性的动作或存在的状态.

通常与副词sometimes, often, usually, always, every day (year, month ), once (twice, three times) a day,等时间状语连用。

E.g. They usually go to school by bike.

I take the medicine three times a day.

She helps her mother once a week.

Mary’s father is a policeman.

There are 50 students in my class.

（2）表示客观真理，科学原理，自然现象，等客观事实或格言，谚语等。

E.g. The sun rises in the east and sets in the west every day.

The man who has never been to the Great Wall is not a real man.

C.、一般现在时的句子转换：

（1）当句子中有be动词或情态动词时，则把be动词或情态动词(can,could等等)提到主语的前面变成疑问句;在be动词或情态动词后面加not变成否定句. E.g. ①陈述句：She is a student.

疑问句→ Is she a student?

否定句→ She is not a student.

②陈述句：I can swim.

疑问句→ Can you swim

否定句→ I can not swim.

(2)当句子中即没有be动词，也没有情态动词时，则在主语前加助动词do (you,以及复数), does（单数she,he,it）变成问句；在主语后谓语动词前加助动词don’t （I,you,以及复数), doesn’t（单数she,he,it）变成否定句，助动词后的动词要变成动词原形。

E.g.①陈述句：We get up at 7:00 every morning.

疑问句→Do you get up at 7:00 every morning?

否定句→We don’t get up at 7:00 every morning.

②陈述句：She has a little brother.

疑问句→ Does she have a little brother?否定句→ She doesn’t have a little brother.

3. 特殊疑问句由"特殊疑问词+一般疑问句"构成：

How old are you?

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