Chuyển sang phủ định và nghi vấn
1 They often play football after school
(-) They don't often play football after school
(?) Do they often play football after school?
2 She goes to school by bike
(-) She doesn't go to school by bike
(?) Does she go to school by bike?
1. - They don't often play football after school.
? Do they often play football after school ?
2. - She doesn't go to school by bike.
? Does she go to school by bike ?