Answer:-

It is a chair I sit on it.

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More About:-

The Simple Present Tense of the verb refers to a state or an event that happens in the present time.

• Ram eats bananas for lunch.
• The earth is round.

The Present Continuous Tense is used for actions which are taking place at the time of speaking.

• She is cooking food.
• She is singing well today.

The Present Perfect Tense is used for an action that has completed in the past, but whose effects are still remained in the present.

• The train has just left.
• We have finished our work.

The Simple Past Tense is used to express an action that took place in the past time.

• I saw an elephant yesterday.
• I wrote a letter to her yesterday.

The Past Perfect Tense is used when we wish to say that some action had been completed before  another was commenced.

• The train had left before I arrived.
• I had finished my work before you came.

The Past Continuous Tense shows an action that continued for some time in the past.

• We were watching a movie.
• She was washing her clothes.

The Simple Future Tense is used for actions that will take place at some point in the future.

• I will study afterwards.
• She will study Commerce for next year.

The Future Perfect Tense is used for an action that will start and be completed at a definite time in the future.

• The will have completed the flyover by this time next year.
• We will have finished by our work before school starts.

The Future Continuous Tense is used for an action that will occur in the future and is expected to continue for a while.

• They will be leaving for Kanpur this week.
• She will be verifying the details before signing the agreement.