1. I think it right that you are helping the poor.

2. I think it right that you help the poor.

3. I think it right that you helped the poor.

4. I think it right that we should help
the poor.

5. I think it right that you should help the poor.
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Which ones are grammatical and natural? Can we omit 'that' in each sentence?

1 answer

All are fine, yes.

No, in these sentences "that" is needed because it is introducing a noun clause in each sentence. You can often omit "that" when it's introducing a relative clause (an adjective clause).
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