STUDENT: In Turkey, there is a proverb about health.
CORRECT!

STUDENT: 'To the well man, every day is a feast'.
CORRECT!

STUDENT: I agree entirely with this sentence.
CORRECT: I entirely agree with this sentence.
EXPLANATION:

a. ENTIRELY is an adverb. It gives information to the verb, adjective or another adverb. The thing that it gives information to is AGREE (which is a verb). So it would be best to position it before AGREE.

STUDENT: Whatever we do, we have to use our body.
CORRECT!

STUDENT: So, to well man's work is always doing well.
REMARKS: Theon, sorry but I could not get the message of this sentence. Please rephrase it.

STUDENT: Before i take a operation, i was well man.
CORRECT: Before I had an operation, I was a man doing well.
EXPLANATION:

a. I is always capitalized regardless on its position in a sentence.

b. Please be careful with A and AN rule.

STUDENT: I have confidence with all things.
CORRECT: I have confidence in all things.
EXPLANATION:

a. IN is used to express involvement in a particular kind of job.

STUDENT: But now, i am afraid of doing physical works.
CORRECT: But now, I am afraid of doing physical works.
EXPLANATION:

a. WORK that is used as a noun is uncountable. Therefore, it can never have -s. WORK that is used as a verb can, however, in your sentence, the word is used as a NOUN.

- Macy