Are they natural?
1)Every person has their own interests.
2)It is important to have a hobby so as to be interesting to other people.
3)Sport strengthens our immune system.
4)Swimming helps people to keep fit.
5)It helps to forget about any problems.

Question

Answer

1) Each person has their own interests.
2) The importance of having a hobby is that it can be of interest to others.
3) Sports strengthen our immune system.
4) Swimming helps people to stay fit.
5) This is a dependent clause. Replace the pronoun "it" with something specific in order for the sentence to be able to stand on its own and make sense.

Answer

You have an agreement problem in sentence 1.
Either: Every person has his/her own interests. Or
All people have their own interests.
2. Having a hobby can help a person be interesting to others.
3. Sports strengthen our immune systems.
4. Swimming helps people to stay fit.
5. Sports help people forget about their problems.

Be careful that you have agreement between  your subject and verb.

Answer

Yes.

Answers · 4

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