Ill and sick
Incorrect : He has been sick for about a month.
Correct : He has been ill for about a month.
Incorrect : The bad smell made me ill.
Correct : The bad smell made me sick.
Note: Ill means in bad health. Sick generally means having a tendency to vomit or temporarily indisposed. Again, ill cannot be used attributively. For example, you cannot say:
He is an ill man.
But sick can be used both attributively and predicatively.
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