日本語の「え」の意味　 meanings of え in Japanese

①え！ or えっ！(今日のテストやばいな

I heard today's test is difficult/I haven't studied well, I can't get good scores→え！今日テストあるの？ what! Do we have a test today?）
➡ show you're surprised at something the person just have said

②えー、、(今日のご飯は焼きナスね today's meal is grilled eggplant→えー、好きじゃない Ehh I don't like it）
➡show disagreements or you don't like that idea

③え？（明日10時集合ね！let's gather at 10 am tomorrow!→え？なんて？ huh?what did you just say?）（あの二人、付き合ってるらしいよ I heard that two are seeing→え？それ嘘じゃないの？what?I heard it was their lie）
➡ just to ask back what you can't hear
show you're surprised, with a bit of doubt, suspicion

④ええ（ミーティングには参加なさいますか？ Are you going to participate in the meeting?ええ、私は参加致します。Yes, I am.）
➡polite "yes" 　　(うん＜はい＜ええ)