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?
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.