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Hi,

Can I say "you are making me feel comfortable" when someone is very nice.

In addition to that, say, there is robot serving my breakfast, can I say, "it's convenient to have such a robot?" I don't think this is quite natural.

Thanks in advance.
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QUOTE: Can I say "you are making me feel comfortable" when someone is very nice.

There's nothing wrong with the grammar but it's an unusual thing to say! You can say "You are making me feel uncomfortable."

I would recommend "I feel comfortable when I'm with you."

BUT! You would say this only to a person with whom you have a close emotional contact. Otherwise it could cause great embarrassment.

If someone is simply being nice (no emotional connection) you could say "thanks for being nice to me" or (dependent on context) "thanks for looking after me", or simply "you are very kind" (safe phrase!)

QUOTE: In addition to that, say, there is robot serving my breakfast, can I say, "it's convenient to have such a robot?" I don't think this is quite natural.

Nothing wrong with it, although it sounds a little formal. I would omit "such".

"It's convenient to have a/this/that robot."
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Actually, I think if you are talking to the robot, you could say, "You are making me feel comfortable", because that sort of sounds like robot language. And if the robot goes on to serve you your breakfast, you could say, "It's convenient to have you, Robot."