Are all of them correct?

[Progress]

If you were to win the lottery, what would you do?
Were you to win the lottery, what would you do?
What would you do were you to win the lottery?

If our daughter should need our help, she would call us
She would call us should our daughter need our help.

I would ask her for a date were I you.

We would have visited you had we known you were in hospital.

This bookshelf would fall forward should there be an earthquake.

Thank you very much

[Anglika]

If you were to win the lottery, what would you do?
Were you to win the lottery, what would you do?
What would you do were you to win the lottery?

If our daughter should need our help, she would call us
She would call us should our daughter need our help. Correct is talking about someone other than the daughter; incorrect if referring to the daughter.

I would ask her for a date were I you. I would ask her for a date if I were you.

We would have visited you had we known you were in hospital.

This bookshelf would fall forward should there be an earthquake.

Thank you very much

..

[Progress]

Thanks Anglika

Our daughter would call us should she need our help.
In this case, our daughter and she are the same person?

Is it incorrect to say that I would ask her for a date were I you?

[Anglika]

Thanks Anglika

Our daughter would call us should she need our help.
In this case, our daughter and she are the same person? The inference from the context is yes.

However, in another context, it could mean "our daughter" will call if someone else (an aunt, a cousin, a neighbour) needs help

Is it incorrect to say that I would ask her for a date were I you? Not incorrect, just uncommon.

.

[Progress]

Thank you very much Anglica