高一英语句式For example,one evening when it was so warm,I stayed a

For example,插入语.
one evening是状语,when引导一个定语从句修饰one evening.
I stayed...by myself缩句为I stayed awake on purpose until half past
eleven.后面的in order to ...by myself是目的状语从句.
所以相对于这个目的状语从句,I stayed awake on purpose until half past
eleven则是主句.