Parts of the following sentence have been given as options. Select the option that contains an error. It is he who work for the company for more than a decade.

Correct — D. In the cleft It is he who ..., the verb inside the relative clause agrees with the antecedent of who. That antecedent is he, third person singular, so the segment must read works, not work.

The duration phrase for more than a decade pushes it further — standard English there is has worked or has been working.

Either repair falls inside the same two words, option (d).

Why the others are wrong

• (a)
  for the company — For the company is an ordinary prepositional phrase naming the employer, and for is the preposition this verb takes. Nothing in it can disagree with anything.
• (b)
  for more than a decade — For more than a decade is a correctly formed duration phrase. It exposes the tense problem but does not contain it — the faulty verb sits in a different segment.
• (c)
  It is he — It is he is the standard cleft opening, and he is the subject form English grammar asks for after the linking verb is. Speech often says It is him, but the printed form is defensible.

A cleft sentence splits one clause in two to throw focus on a chosen element: It is he who works here, rather than He works here.

The rule error-spotters test is that the relative pronoun inherits the person and number of its antecedent. In It is he who works, who stands for he, so the verb is singular. In It is they who work, who stands for they, so it is plural.

The trap is the word is, sitting right before who and tempting you to agree the verb with the wrong thing.

Key facts

• In a cleft of the form It is X who..., the verb after who agrees with X, not with is.
• It is he who works is singular, while It is they who work is plural.
• A duration phrase with for normally takes the present perfect: has worked, has been working.
• After a linking verb, formal grammar uses the subject pronoun: It is he rather than It is him.

Common traps

• Agreeing the relative verb with it or with is instead of with the antecedent he.
• Marking It is he as the error because It is him sounds more natural in speech.
• Noticing the missing present perfect and blaming the duration phrase rather than the verb.

No directly related past PYQ was found.