Hi everyone. I'm a new learner. Today, i saw my friend on facebook, he looks very well. i want to as
Hi everyone. I'm a new learner. Today, i saw my friend on facebook, he looks very well and... fat . i want to ask him about his weight. Can you guys teach me how do i say ?

Question

Hi everyone. I'm a new learner. Today, i saw my friend on facebook, he looks very well. i want to as
Hi everyone. I'm a new learner. Today, i saw my friend on facebook, he looks very well and... fat . i want to ask him about his weight. Can you guys teach me  how do i say ?

Answer

In US culture it is considered rude to ask about someone's weight or to call them fat, so this is hard to answer. If you must ask, you could say, "are you OK? It looks like you've put on a little weight."  But I'd find something else to talk about.