Question

1. He did his presentation in the period.
2. He did two presentations this week in front of other co-workers.
3. I had to pay some amount of service money for using the ATM.
4. In a bank we can join a fund product.

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Are the sentences above grammatical?
If not, would you correct them?

Answer 1

1. The grammar is technically OK, but it would look less awkward if written "He made his presentation during the period".
2. This is also OK gramatically, but "made" is a better verb choice than "did".
3. "some amount" is more correctly "an amount", to match a singular article with a singular noun. The whole phrase "some amount of service money" sounds awkward. It would read much better as "I had to pay a fee for using (or 'to use') the ATM."
4. This is grammatically OK, but you might want to specify "the bank" or a particular bank, because not all banks offer "fund products". I assume you mean mutual funds. Also, you don't technically "join" a fund, you purchase shares in it, or invest in it.