Subjunctive

[jack]

Are these correct? If not, why? What do they mean?
1. Is it okay if he come?
2. Is it okay if he comes?

3. If she come back then its meant to be.
4. If she comes back then its meant to be.

Thanks.

[Tdol]

In BrE, we almost never use the present subjunctive. In both cases I'd say add -s, and in the second example it sounds wrong.

[jack]

In both cases I'd say add -s,

So without -s is right too
1. Is it okay if he come? (So in BrE, this is right?)
2. Is it okay if he comes?

In BrE, we almost never use the present subjunctive.

Do you mean this:
3. If he comes here, she will go home.

4. If she were rich, she could buy this coat. (correct)
5. If she was rich, she could buy this coat. (correct)
6. If she are rich, she can buy this coat. (Why is #4 correct, and this is incorrect?)
7. If she is rich, she can buy this coat. (correct)
Thanks.

[jack]

1. Everybody need to return home! (Is this subjunctive? A command? So is 'need' here correct? If not, why?)Thanks.

[Tdol]

Everybody needs to return home.

I don't think you can make an imperative out of 'need' very easily and there's no call for a subjunctive there.