Well, I thought maybe we could go out for dinner tonight.
今夜夕食を食べにいきませんか
What's for dinner
夕食のメニューは？
when
[接]1 【同時】…のとき1a …のときはいつも（whenever）When I read a newspaper I read all of it.新聞を読むときはいつも隅々まで読む1b …と...
why
[副]【疑問副詞】1 【理由・原因・目的】なぜ，どうして，何のためにWhy do you think so?どうしてそう考えるのですかI don't know why, but I am ver...
Why don't you have supper here, too?
君もここで夕食をとればいいのに．
why don't you?
〔命令文の後で〕((略式))どうです，そうしたら（◆命令の緩和）Stay for dinner, why don't you?夕食までいなさいよ
You may as well have dinner with us.
一緒に夕食を食べませんか（◆主語が二人称だと提案を表す）
