unit2第3课时单元语法精讲与精练

Unit

2How

often

do

youexercise?第三课时单元语法精讲与精练金榜行动八年级英语(上册)•R单元语法精讲一、一般现在时概念：一般现在时通常表示经常发生的或习惯性的动作或目前的状态。一般现在时的肯定式、否定式和一般疑问式及回答：(1)动词be

疑问式和简略答语：肯定回答：Yes，人称代词＋对应be

动词。否定回答：No，人称代词＋对应be

not.(或缩写形式)(2)行为动词的一般现在时，其肯定句、否定句和一般疑问句的构成如下：当主语是第一人称(I，we)、第二人称单、复数(you，you)和第三人称复数(they)时；肯定句：主语＋动词原形＋……否定句：主语＋助动词do＋not

＋动词原形＋…一般疑问句：助动词Do＋主语＋动词原形＋…？肯定回答：Yes，主语＋do否定回答：No，主语＋don't(3)当主语是第三人称单数(she，he，it)时：肯定句：主语(单三)＋动词＋s/es＋…否定句：主语(单三)＋助动词does＋not＋动词原形＋…一般疑问句：助动词Does＋主语(单三)＋动词原形＋…？肯定回答：Yes，主语(单三)＋does否定回答：No，主语(单三)＋doesn't二、频度副词的位置usually，sometimes，always，often

等词在英文中被称为“频度副词”，是用来表示动作频率的，但程度上有区别。一般说来可按频率大小排列为：always＞usually＞often＞sometimes＞seldom(很少)＞never(决不)1．在be

动词之后。eg：She

is

sometimes

very

busy.她有时很忙。

2．在第一个动词或情态动词之后。eg：I

will

never

forget

the

first

time

I

metyou.我将永远忘不了和你的第一次见面。在实义动词之前。eg：We

often

go

there.我们常去那儿。sometimes

也可放在句首、句中或句末，often

也可放在句末。eg：Sometimes

she

writes

tome.她有时候给我写信。

She

writes

to

me

often.她经常给我写信。三、频度副词的用法often，always，usually

等通常和一般现在时连用，表示现在经常或反复发生的动作。eg：It

often

rains

here

in

April.这儿四月份常下雨。always

与进行时连用时，并不强调动作正在进行，而是表示赞叹、厌烦等情绪。eg：He

is

always

thinking

of

others.他总是想着别人。(赞叹)She

is

always

asking

sillyquestions.她老是问些愚蠢的问题。(厌烦)3．对这些频度副词提问时，用how

often。eg：I

write

to

my

brother

sometimes.How

often

do

youwrite

toyour

brother?单元语法精练Ⅰ、单项选择。)1.EveryonedislikesBobbecausehe

helps

others.A．alwaysC．oftenB．neverD．usually—Every

day.A．HowsoonC．HowlongB．How

oftenD．How

far(

B(

B

)2.—

do

you

do

your

homework?)3.My

uncle

works

in

America.He

comes

home

to

visit

mygrandparents

A．three

time

a

yearC．three

timesyearB．three

times

a

yearD．three

time

year)4.—

students

in

your

class

come

from

Wuhan?(

B(

A—Only

one.A．How

manyB．How

oftenC．How

muchD．How

old(

C

)5.Myhomework.motherasksme

basketball

before

finishing

myA．playB．to

playC．not

to

playD．to

not

playⅡ、根据句意用所给动词的适当形式填空。6．My

brother

doesn't

play (not

play)basketball.7．David

has

(have)

two

basketballs.

Does

Zhang

Yang

have

(