Cognition is impaired by narcotic drugs.
This scentence would work: Capitalism is retarded.
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Maybe because, what if the word also is the first word of the scentence. You also don't use it when you have a scentence like: I also like bananas and strawberries. What I mean is, is that it depends on the scentence.
You don't.
we all had a separate alcove
The invention of the wheel was a revolution.
He noticed his hair had receded.
Let's go check out the delta.
No, unless there is another reason to capitalize it.
The tone of the bell resonated in the halls of the cathedral.
"She wore a candid expression." "We had a very candid discussion."
Politics and argument go hand in hand.