以系动词 be 开头.这类祈使句的常用结构为“be+形容词/名词”.如：
be more careful next time.下次细心点.
be sure and come as soon as possible.你一定要尽快来.
be quick,or it may be too late.快点,不然就会迟到.
以系动词 be 开头.这类祈使句的常用结构为“be+形容词/名词”.如：
be more careful next time.下次细心点.
be sure and come as soon as possible.你一定要尽快来.
be quick,or it may be too late.快点,不然就会迟到.