为什么what直接加happen,而how加助动词did加happen
为什么what直接加happen,而how加助动词did加happen
what happen为什么没有助动词
what happen后面要加什么词?
为什么有时happen用助动词进行提问,而有时则不用?如:What will happen...What happene
What happens to trees in the different seasons?happen为什么加s
I didn t know what was happening outside这句话中为什么happen加ing?
what do you think to happen there yesterday 中"TO"为什么Y要加?
"happen"后加“ing”,要不要双写“n”?
--How did the accident happen?
倒装句为什么要加did这种助动词?
what happened 为什么不可以用 what did happen
为什么是What happened?而不是 What did happen?