preposition, adjective, verb, place name, adverb, pronoun, noun, directional · towards; at; for; concerning; regarding; to treat someone in a certain way

他对我非常友好。

adjective, verb, preposition, modal particle, particle, noun, punctuation, adverb · right; correct

你说得很对。

measure word, preposition, verb, numeral · classifier for a couple or pair

那一对夫妻很恩爱。

adjective · used as an affirmative response, equivalent to "yes" or "that's right".

对，我记得你。

preposition, verb · to adjust; to fit; to suit

钟慢了，我得把它对手表上的时间对一下。

verb, preposition · to check; to compare

我们再对一下名单。

verb, adjective · to add or pour in a fluid; to dilute

往酒里对点儿水。

verb, adjective · to face; opposite; facing; matching; to match together

两座建筑相对而立。