❶否定文でまだ（～しない）
He is not here yet.=He is not yet here.
He is not here yet.=He is not yet here.
彼はまだここに来ていません.
⦣ yet はふつう文末に来る. 後ろの文は文語的.
Let's climb some more. We're not at the top yet.
Let's climb some more. We're not at the top yet.
もう少し登りましょう. まだ頂上じゃないんです.
Don't eat your dessert yet.
Don't eat your dessert yet.
まだデザートを食べちゃだめよ.
Bob is still playing baseball. He isn't studying yet.
関連語Bob is still playing baseball. He isn't studying yet.
ボブはまだ野球をしてます. まだ勉強にかかっていません.
⦣ 肯定こうてい文の「まだ（～だ）」は still.
＊会話＊
Hasn't he come yet?—No, not yet.
⦣ not yet は He has not come yet. を短くした言い方. ともに現在完了かんりょうの文 （have助動❶）.
❷肯定の疑問文でもう（～したか）, 既すでに
Are you homesick yet?
Are you homesick yet?
君はもう家が恋こいしくなったの?
Is Bob out of bed yet?—No, he isn't awake yet. He is still asleep.
会話Is Bob out of bed yet?—No, he isn't awake yet. He is still asleep.
ボブはもう起きましたか.—いや, まだ起きていない. まだ眠ねむっている.
⦣ 2番目の yet は ❶.
Has the postman come yet?—Yes, he has already come.
関連語Has the postman come yet?—Yes, he has already come.
郵便屋さんはもう来ましたか.—はい, もう来ました.
関連語肯定の平叙へいじょ文の「もう（～した）」は already.
