** Đổi các câu sau sang phủ định và nghi vấn:
1/Nam is writing a letter.
à_____________________________________________
à_____________________________________________
2/She listened to music yesterday morning.
3/Ba and Lan were in the library last Tuesday
4/They cleaned their rooms two hours ago.
5/We had a wondeful holiday in the past.
6/His brother decorated the house last month.
7/Mai buys a new bike.
8/Children brush their teeth after meals.
9/Mrs Lien took his children to the zoo last Saturday.
10/She made breakfast for her family.
11/They are painting their house yellow.
12/This dress was beautiful.
13/I saw her two days ago.