【把下列句子改为否定句和一般疑问句.I'vealreadyhaddinner.I__________dinner_____＿＿＿＿＿＿＿＿＿＿dinner＿＿＿＿?Hehasjustfinishedhishomework.He＿＿＿＿＿＿＿hishomew】

　　把下列句子改为否定句和一般疑问句.

　　I've already haddinner.

　　I ______ ____dinner _____

　　＿＿＿＿　＿＿＿＿＿＿dinner　＿＿＿＿?

　　He has just finished his homework.

　　He ＿＿＿＿ ＿＿＿his homework ＿＿＿＿

　　＿＿＿＿he ＿＿＿his homework ＿＿＿＿?

　　Mum'scooked the dinner.

　　Mun ＿＿＿＿　＿＿＿the　dinner．

　　＿＿＿＿　Mum　＿＿＿＿　the　dinner?