祈使句的结构:
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)。如:
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。如:
Let's包括说话者
Let's have another try,shall we / shan't we?= Shall we have another try?
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.
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