Your first sentence is correct, although one could try to rephrase it so as to not have two uses of "for" in a row. The second two are not idiomatic English. They use "wait" as a transitive verb, which can be done, but it is rarely used. Your last question "wait your turn" has a common transitive use of "wait". There is also the verb "await", which means to "wait for". This would work in your third sentence, but not in your second.Originally Posted by whl626
You could also say:
I am waiting for someone to give his opinion.
I am waiting for someone's opinion.
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