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Are these sentences correct in American English Language?

1)After the war began,evil took place.

2)Do you know tag questions? Do we need to add (the) before tag?

3)Do you know tag question?

Thanks Emotion: smile
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bassa1)After the war began,evil took place.
Evil is not an event, so it can't "take place". This is like saying "*Size happened", "*Length happened", or "*An amount of money occurred". The two things don't go together.
bassa2)Do you know (anything about) tag questions? Do we need to add (the) "the" before a tag?
As corrected.
bassa3)Do you know tag question?
This won't work. Use one of these:

Do you know anything about tag questions?
Do you know how tag questions work?
Do you know what a tag question is?
Do you know what tag questions are?

CJ
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Thanks Emotion: smile