[Since If]he doesn't come I won't come[too either]

问题补充：

[Since,If]he doesn come,I won come[too,either].He asked me[since,if]I would go there with him.

答案：

第一个If 第二个either 第三个If

第一个是if引导的条件状语从句

第二个是either做否定句的也

第三个是宾语从句,这里表是否