English grammar error-spotting (‘‘too … to’’ construction; intensifier usage): Read the sentence and pick the erroneous segment only if present; otherwise choose ‘‘No error’’: ‘‘He is / too intelligent / to make a mistake. / No error.’

Grammar checkThe idiom ‘‘too + adjective + to + verb’’ can mean ‘‘so … that not’’; here it conveys ‘‘so intelligent that he does not make mistakes’’. The construction is acceptable and idiomatic.

Common pitfalls

• Assuming ‘‘too … to’’ is always ungrammatical—what matters is the intended negative result implied.

Final AnswerNo error.