Find the most suitable option to replace the verb in bold to retain the meaning of the sentence.
Here is coming my brother.

Identify the tense used in the following sentence:
I have been working on the problem.

A. Present Continuous

B. Present Perfect Continuous

C. Past Perfect

D. Past Continuous

Identify the tense used in the following sentence:
They will have been writing their letters.

A. Future Perfect Continuous

B. Future Continuous

C. Present Perfect Continuous

D. Present Perfect

Identify the tense used in the following sentence:
I will represent him in court.

A. Simple Present

B. Simple Future

C. Simple Past

D. Future Continuous

Identify the tense used in the following sentence:
I will give him a gift.

A. Simple Present

B. Simple Past

C. Present Continuous

D. Simple Future