你今天看上去很傷心。 You look sad today.
你今天好像不高興。You dont look very happy today.
你看起來很疲憊。You look exhausted.
你該放松放松了。You should take it easy.
你今天有點兒不大對勁。Something is wrong with you today.
放松點兒。Kick back!
別急。There's no need to rush.