改为祈使句的否定形式 t run so fast
动词的祈使形式选择、劝告或命令。
The imperative form of the verb optates, exhorts, or commands.
由一个祈使形式和一个疑问形式嵌合而成，表达祈使、疑问两种功能。
The Q-imperative sentence comprises an interrogative form which is inserted in an imperative form, and functions both as an interrogative sentence and as an imperative sentence.
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