Could you correct the sentence of will be there at that time.?

The sentence "will be there at that time" is grammatically correct but incomplete. To make it a complete sentence, you need to add a subject.

Here are some examples:

* I will be there at that time.

* He will be there at that time.

* The team will be there at that time.

* We will be there at that time.

It depends on who or what will be there.