Do you think 后面不可加how,when,why,what这样的问句,只能是加陈述语句,像 Do you think we can get this done?Do you think you can afford a car? 要问how,when,why,what得这样用, When do you think he will arrive?What do you think is the reason of delay?How do you think this could happen?How many apples do you think there are on the tree.