Question

l haven't heard from him since he went to america是复合句还是简单句

Answer 1

l haven't heard from him since he went to america是复合句。

简单句指的是主语加谓语、并列主语加谓语、主语加并列谓语。复合句指的是由主句和从句构成。

而l haven't heard from him since he went to america除了有“l haven't heard from him”住居外，还有由since引导的从句，即后半部分。所以这里是从句。

复合句类型：

主语从句：作句子主语的从句叫主语从句。主语从句通常由从属连词that，whether，if和连接代词what，who，which，whatever，whoever以及连接副词how，when，where，why等词引导。

表语从句：在句中作表语的从句叫表语从句。引导表语从句的关联词与引导主语从句的关联词大致一样，表语从句位于连系动词后，有时用as if引导。其基本结构为：主语＋系动词＋that从句。

定语从句：定语从句（Attributive Clauses)在句中做定语，修饰一个名词或代词，被修饰的名词，词组或代词即先行词。定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。