Unit

2How

often

do

youexercise?第三課時單元語法精講與精練金榜行動八年級英語(上冊)?R單元語法精講一、一般現(xiàn)在時概念：一般現(xiàn)在時通常表示經常發(fā)生的或習慣性的動作或目前的狀態(tài)。一般現(xiàn)在時的肯定式、否定式和一般疑問式及回答：(1)動詞be

疑問式和簡略答語：肯定回答：Yes，人稱代詞＋對應be

動詞。否定回答：No，人稱代詞＋對應be

not.(或縮寫形式)(2)行為動詞的一般現(xiàn)在時，其肯定句、否定句和一般疑問句的構成如下：當主語是第一人稱(I，we)、第二人稱單、復數(shù)(you，you)和第三人稱復數(shù)(they)時；肯定句：主語＋動詞原形＋……否定句：主語＋助動詞do＋not

＋動詞原形＋…一般疑問句：助動詞Do＋主語＋動詞原形＋…？肯定回答：Yes，主語＋do否定回答：No，主語＋don't(3)當主語是第三人稱單數(shù)(she，he，it)時：肯定句：主語(單三)＋動詞＋s/es＋…否定句：主語(單三)＋助動詞does＋not＋動詞原形＋…一般疑問句：助動詞Does＋主語(單三)＋動詞原形＋…？肯定回答：Yes，主語(單三)＋does否定回答：No，主語(單三)＋doesn't二、頻度副詞的位置usually，sometimes，always，often

等詞在英文中被稱為“頻度副詞”，是用來表示動作頻率的，但程度上有區(qū)別。一般說來可按頻率大小排列為：always＞usually＞often＞sometimes＞seldom(很少)＞never(決不)1．在be

動詞之后。eg：She

is

sometimes

very

busy.她有時很忙。

2．在第一個動詞或情態(tài)動詞之后。eg：I

will

never

forget

the

first

time

I

metyou.我將永遠忘不了和你的第一次見面。在實義動詞之前。eg：We

often

go

there.我們常去那兒。sometimes

也可放在句首、句中或句末，often

也可放在句末。eg：Sometimes

she

writes

tome.她有時候給我寫信。

She

writes

to

me

often.她經常給我寫信。三、頻度副詞的用法often，always，usually

等通常和一般現(xiàn)在時連用，表示現(xiàn)在經?；蚍磸桶l(fā)生的動作。eg：It

often

rains

here

in

April.這兒四月份常下雨。always

與進行時連用時，并不強調動作正在進行，而是表示贊嘆、厭煩等情緒。eg：He

is

always

thinking

of

others.他總是想著別人。(贊嘆)She

is

always

asking

sillyquestions.她老是問些愚蠢的問題。(厭煩)3．對這些頻度副詞提問時，用how

often。eg：I

write

to

my

brother

sometimes.How

often

do

youwrite

toyour

brother?單元語法精練Ⅰ、單項選擇。)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、根據(jù)句意用所給動詞的適當形式填空。6．My

brother

doesn't

play (not

play)basketball.7．David

has

(have)

two

basketballs.

Does

Zhang

Yang

have

(