`a`) I'm the best in my class.
`=>` I'm not the best in my class.
`b`) Mark does homework in the evening.
`=>` Mark doesn't do homework in the evening.
`c`) We play football after school.
`=>` We don't play football after school.
`d`) You run fast.
`=>` You don't run fast.
* Cấu trúc thể phủ định hiện tại đơn:
+) I/You/We/They + don't / do not + Vinf
+) He/She/It + doesn't / does not + Vinf