15. Could you check my sentences. Thank you very much

Question

1. I wish I could go back in time to ancient Greece.
2. I wish I had a sister or brother who spoke another language.
3. Imagine we could have sailed to Troy to save Helen!
4. I wish we could go back and change the past.
5. Don't you wish we could travel more?

Answer 1

All look fine except for #3.

How can you fix #3?

Answer 2

Imagine that we could have sailed to Troy to save Helen!

But I am not really sure

Thanks

Answer 3

Yes, that's right!

Also this ...
Imagine! We could have sailed to Troy to save Helen.