Answer:
There are a few ways you can fix this sentence:
(Just choose one of the following⤵⤵⤵)
- He won't be able to come tomorrow.
- He isn't able to come tomorrow.
- He can't come tomorrow.
Explanation:
"Couldn't" is past tense, while tomorrow tells us the event hasn't happened yet. So thus, "couldn't" wouldn't make any sense in this sentence.
Hope this helps :)
