what time is it now???
when在英语里有三种词性:
特殊疑问词,“什么时候”,后面跟一般疑问句语序。如:
When were you born?
When will the class begin?
When do you start work and finish work?从属连接词,“当什么时候”,引导时间状语从句,后接陈述句的语序,如:
He always helps me when I am in trouble.
When my dad came back, I was watching TV.缩合连接副词,引导名词性从句。
This was when I was born.
Do you know when the class will begin?
I don't know when they will achieve the goal.
此外,疑问副词when后面加动词不定式to do(注意,when后面没有接动名词doing的用法),可以作句子的主语,表语、宾语等,如:
I don't know when to use the sentence pattern.
When to go is a problem.
The problem is when to begin the class.