祈使句讲解

Turn left Be careful Keep off of the grass
Don't eat or drink Don't smoke Don't park here
No food or drink No smoking No parking
肯定祈使句
Do型(即：动词原形(+宾语)+其它成分)。如：Please have a seat here
No+动名词/名o food!
Thank You！
Turn left.
有的祈使句在意思明确的情况下，动词可省略。如：This way,please. = Go this way,please.
Be型(即：Be +表语(名词或形容词)+其它成分)。如：Be a good child!
Be careful!
Let型(即：Let + 宾语 + 动词原形 + 其它成分)。如：Let me help you.
Let her go.
否定祈使句
Do型和Be型的否定式都是在句首加don't构成，如：
Don't make such a noise. Don't be late for school!
Let型的否定式有两种：既“Don't + let +宾语+动词原形+ 其它成分”和
“Let + 宾语 + not + 动词原形 + 其它成分”。如： Don't let him go. Let him not go.
Don't park No parking
Turn left Be careful Keep off of the grass
Don't eat or drink Don't smoke Don't park here
No food or drink No smoking No parking
祈使句因对象（即主语）是第 二人称you，所以通常都省略。
Imperative Sentence
祈使句
祈使句（Imperative
Sentence） 用于表达命令、请求、劝告、警告、 禁止等的句子叫做祈使句，祈使句 最常用于表达命令，因此在学校文 法中也常称为命令句。
Turn left
Be careful Keep off of the grass
Don't eat or drink Don't smoke No food or drink No smoking