pass him the dictionary,please.句子成分结构分析.

问题描述:

pass him the dictionary,please.句子成分结构分析.

这是祈使句 pass为谓语后接双宾语him和the dictionaryplease就是个表请求的词那主语呢?祈使句省略主语you祈使句省略主语you那什么情况下主语可以省略啊T^T?就是祈使句