In which sentence is the verb in the future progressive?

Question

I will have bought a new suit by then.

I will have been buying a new suit by then.

I will buy a new suit by then.

I will be buying a new suit by then.

Answer 1

The sentence with the verb in the future progressive is:

I will be buying a new suit by then.

The future progressive tense indicates an action that will be ongoing in the future.