A: How are you feeling?

B: Much better, thank you.

(What is the full form of "Much better"? Is it #1 or #2? )

1. I am feeling much better.
2. I feel much better.

Both 1 and 2 can be considered the full meaning of B.

The full form of "Much better" can be either option #1 or option #2. Both options convey the same meaning but use slightly different sentence structures.

Option #1: "I am feeling much better."
Here, the speaker uses the present continuous tense to describe their current state. They express that their feelings have recently improved, indicating a temporary or ongoing change.

Option #2: "I feel much better."
In this case, the speaker uses the simple present tense to describe their general state. They express a more permanent or long-term improvement in their feelings.

So, either option can be used to convey that the person is currently feeling much better, but the choice depends on whether you want to emphasize a temporary state (option #1) or a general, ongoing improvement (option #2).