祈使句结构

祈使句用以表达命令，要求，请求，劝告等。

1）

祈使句有两种类型，一种是以动词原形开头，在动词原形之前加do

(但只限于省略第二人称主语的句子)。

take

this

seat.

do

be

careful.

否定结构：

don't

move.

don't

be

late.

2）

第二种祈使句以let开头。

let

的反意疑问句

a.

let's

包括说话者

let's

have

another

try，shall

we

/

shan't

we?

=

shall

we

have

another

try?

b.

let

us

不包括说话者

let

us

have

another

try，will

you

/

won't

you?

=

will

you

please

let

us

have

another

try?

否定结构：

let's

not

talk

of

that

matter.

let

us

not

talk

of

that

matter.