What's the difference between these two questions?
What caused the accident?
and
What did the accident cause?
I have a trouble understanding questions with "What". I can't understand when "What" is the subject and when it's the object.
BoSsSy What's the difference between these two questions? andWhat did the accident cause? The second one challenges common sense.
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BoSsSyWhat's the difference between these two questions? What caused the accident?andWhat did the accident cause?
The second one challenges common sense. You cannot paraphrase #1 as #2.
BoSsSyWhat caused the accident?
Do you have trouble with this question?
Who caused the accident?
Who is a human actor - the person at fault. Someone who drives recklessly or runs red lights can cause an accidf1111 sent.
If you understand that one, then you should be able to understand this one:
What cause