The word "envy" can be used as a verb or as a noun. Verb: I envy my neighbour. He has such a lovely car. Noun: When I think about my neighbour's car, the emotion I feel most is envy.

Sorry, I don't know "羡慕" and "嫉妒", but I can give you some examples. In English, you can use "envy" as a verb or a noun: 1) I envy him [because he has a lot of money]. 2) She was full of envy. Both the verb and the noun mean "jealous" and "to be jealous", respectively. 1) I am jealous of him 2) She was full of jealousy. I hope that helps! :) Kind regards, Choppy