Find if there is any grammatical error in any part of the sentence below and mark that part as your answer. If there is no error, mark 5 as your answer.
He loosened his temper/ whenever he knows/ things do not take place/ as per his planning.
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Always check for Collocations (words that naturally go together). You "lose" your temper, you "loose" an arrow, and you "loosen" a screw. If a verb feels slightly "off" in a common expression, it's likely a word-choice error.