rewrite
1.the boy usually drank milk when he was small
-the boy used
2.he usually came late in the morning
-he used
3.he would go hunting when he was in Africa
-he used
4.john fished in the river when he was young
-john used to
5.they often went swimming in the afternoom
-they used to
6. marry alway went swimming after school
-mary used
7.jane never studied french well when he was a student
-jane used to
8.he usually got up late in the morning
-he used
rewrite
1.the boy usually drank milk when he was small
-the boy used to drink milk when he was small.
2.he usually came late in the morning
-he used to come late in the morning.
3.he would go hunting when he was in Africa
-he used to go hunting when he was in Africa
4.john fished in the river when he was young
-john used to fish in the river when he was young.
5.they often went swimming in the afternoom
-they used to go swimming in the afternoom.
6. marry alway went swimming after school
-mary used to go swimming after school.
7.jane never studied french well when he was a student
-jane used to study french well when he was a student.
8.he usually got up late in the morning
-he used to get up late in the morning.
1.the boy usually drank milk when he was small
-the boy used to drink milk when he was small
2.he usually came late in the morning
-he used to come late in the morning
3.he would go hunting when he was in Africa
-he used to go hunting when he was in Africa
4.john fished in the river when he was young
-john used to fish in the river when he was young.
5.they often went swimming in the afternoom
-they used to go swimming in the afternoom
6. marry alway went swimming after school
-mary used to go swimming after school.
7.jane never studied french well when he was a student
-jane used to not study french well when he was a student
8.he usually got up late in the morning
-he used to get up late in the morning
HỌC TỐT 
Phạm Trần hoàng anh: chắc e làm đúng đó, xét theo nghĩa thì chỗ đó nên có not :)