when與while引導(dǎo)時(shí)間狀語從句的區(qū)別課件

2013年版英語八下Unit5過去進(jìn)行時(shí)過去進(jìn)行時(shí)表示過去某一時(shí)刻或某一段時(shí)間正在進(jìn)行或發(fā)生的動(dòng)作，其結(jié)構(gòu)為：was

/

were

+

v.

–ing。I/He/She/It

was

+v-ing…

(第一三人稱單數(shù)用was)We/You/They

+v-ing…（1）過去進(jìn)行時(shí)的否定句結(jié)構(gòu)為：was

/were+

not

+v.

-ing

，was與not?？s寫為wasn’t，were與not?？s寫為weren’t。（2）過去進(jìn)行時(shí)的一般疑問句結(jié)構(gòu)為：Was

/

Were

+主語+

v.

-ing+其他？（3）過去進(jìn)行時(shí)的特殊疑問句結(jié)構(gòu)為：疑問詞+

was

/

were+主語+v.

-ing+其他？（二）用法1.

表示過去某一時(shí)刻或某一段時(shí)間正在進(jìn)行或發(fā)生的動(dòng)作。與過去某一特定的時(shí)間狀語連用，常見的有：at

3o’clock

yesterday

afternoon,

in

thosedays,

at

this

time

yesterday等。2.

表示過去一個(gè)動(dòng)作發(fā)生時(shí)，另一個(gè)動(dòng)作正在進(jìn)行，持續(xù)時(shí)間長的動(dòng)作用過去進(jìn)行時(shí)，常用在while引導(dǎo)的時(shí)間狀語從句中。Ⅰ.

用所給詞的適當(dāng)形式填空was

helping1.

I

__________

(help)

my

mother

withhousework

at

ten

o’clock

last

Sunday.Shanghai

soon.Ⅱ.

句型轉(zhuǎn)換1.

Kate

was

drawing

pictures

when

hermother

came

back.

（改為否定句）wasn’t

drawingKate

______

_________

pictures

whenher

mother

came

back.2.

She

was

babysitting

her

sister

at

thistime

yesterday.

（改為一般疑問句）_W__a_s__

she

_b_a_b_y_s_it_t_in_g__

her

sister

atthis

time

yesterday?3.

They

were

having

a

party

when

Iknocked

at

the

door.

（就劃線部分提問）_W__h_a_t_

_w__er_e__

they

_d_o_i_n_g_

when

youknocked

at

the

door?3.

I

was

sleeping

_w_h__en__

my

cousin

cameto

see

me.4w.

My

mhotheirlwas

doing

the

houseworke_

__

_

_

_

I

was

doing

myhomework.5.

______

the

alien

was

in

the

shop,

theWhilegirl

called

the

police.when引導(dǎo)的時(shí)間狀語從句可以表示一個(gè)時(shí)間點(diǎn),也可以表示一個(gè)時(shí)間段。從句中可以用短暫性動(dòng)詞,也可以用延續(xù)性動(dòng)詞。從句中的動(dòng)作既可與主句的動(dòng)作同時(shí)發(fā)生，又可在主句的動(dòng)作之前或之后發(fā)生。l

It

was

snowing

when

we

got

to

the

airport.我們到達(dá)機(jī)場(chǎng)時(shí),

天正下著雪。l

My

key

dropped

on

the

ground

when

I

waswalking

in

the

park.while引導(dǎo)的時(shí)間狀語從句常指一個(gè)時(shí)間段,從句中的動(dòng)詞必須為延續(xù)性動(dòng)詞。while有時(shí)還可表示主句的動(dòng)作與從句的動(dòng)作同時(shí)發(fā)生。l

While

he

was

reading,

the

phone

rang.他正在看書時(shí),

電話鈴響了。一些學(xué)生在讀書,

另一些學(xué)生在寫字。tips:1.當(dāng)時(shí)間狀語從句中的動(dòng)作與主句中的動(dòng)作同時(shí)發(fā)生，且從句動(dòng)作為延續(xù)性動(dòng)詞時(shí)，when

與while都可以使用。2.when

說明從句的動(dòng)作各主句的動(dòng)作可以是同時(shí)發(fā)生，也可以是先后發(fā)生，while則強(qiáng)調(diào)主句的動(dòng)作在從句動(dòng)作的發(fā)生過程中發(fā)生或者主從句動(dòng)作同時(shí)發(fā)生。tips:1.通常情況下when能替代while,

但while不能替代when.2.當(dāng)從句和主句都用過去進(jìn)行時(shí)的時(shí)候，多用while引導(dǎo)。(2009四川瀘州)

What

were

you

doing_____

Zhang

Fan

came

in?A.

when

B.

while

C.

where【解析】三個(gè)選項(xiàng)分別意為“當(dāng)……時(shí)”、“與……同時(shí)”、“哪里”，結(jié)合題意“當(dāng)張凡進(jìn)來時(shí)，你正在做什么？”可排除B、C二項(xiàng)，故選A。A.

Fill

in

the

blanks

with

the

given

words.3.

They

_____________

(watch)

TV

at__________.writingB.

Translate

these

sentences

into

English.1.

上課鈴響時(shí)，你在干什么？What

________

you

______when

thewerewas

readingI

______________when

my

mother

camein.was

coo