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if..,besureIfyouhaveanytrouble,besuretocallme.ifsundayisconvenientforyou,besuretocometogettoghter这里怎么没有一个主句啊.besure这个是句子吗?为什么没有主语?

题目详情
if..,be sure
If you have any trouble,be sure to call me.
if sunday is convenient for you,be sure to come to get toghter
这里怎么没有一个主句啊.be sure这个是句子吗?为什么没有主语?
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答案和解析
be sure这个是句子,是祈使句句,主语省略不写了.补充完整应是If you have any trouble,you are sure to call me.
if sunday is convenient for you,you are sure to come to get toghter