在短语 'Leave him alone!' 中，动词 'leave' 是命令式。

In the phrase 'Leave him alone!', the verb 'leave' is an ___imperative.

在语法中，命令式是一种用于发出命令的动词形式。

In grammar, the ___imperative is a verb form used for giving commands.

学会正确使用命令式对于有效沟通至关重要。

Learning how to use the ___imperative correctly is essential for effective communication.