Is this sentence OK?
(someone changed a lot) I'm talking to someone on the phone.
If I say;
If you saw him, you wouldn't believe your eyes.

Question

Answer

It depends if the changes are physical then you wont believe your eyes.

If the change is in personality then you would say.  "If you saw him, you wouldn't believe how much he has changed.

Answer

Yes that is just fine, also it's International English. No need to worry about AM or BR English or any other English. Also take into account Bill's comment.

Answer

yes, it is okay

Answer

Yes, that is something a native speaker would say.

Answer

Yes, that sounds reasonable.