* "You okay?" - You would sign "YOU" (pointing at the person), then "OKAY".
* "Is everything okay?" - You would sign "EVERYTHING" and then "OKAY".
* "Are you feeling okay?" - You would sign "FEEL" and then "OKAY".
Remember, sign language is a visual language, so facial expressions and body language are crucial for conveying meaning. When signing "okay", you would likely use a positive facial expression and a slight nod of your head.
It's important to note that sign language varies significantly across different cultures and regions. If you are interacting with someone who uses a different sign language, it's best to ask how they would sign "are okay".