1.They are effective workers. 

=>They work effectively

2.We are hard-working students.

=>We work hardly

3.Lan can speak English fluently.

=>Lan is a fluent English speaker

4.My cousin, Long is good at playing soccer.

=>My cousin, Long can play  soccer well

5.Hoa is a bad learner of Math.

=> Hoa  studies Math badly

6.Cong Vinh and Cong Phuong are very good footballers.

=> Cong Vinh and Cong Phuong  play football very well

1.They are effective workers. 

=>They work effectively

2.We are hard-working students.

=>We work hardly

3.Lan can speak English fluently.

=>Lan is a fluent English speaker

4.My cousin, Long is good at playing soccer.

=>My cousin, Long can play soccer well

5.Hoa is a bad learner of Math.

=> Hoa  studies Math badly

6.Cong Vinh and Cong Phuong are very good footballers.

=> Cong Vinh and Cong Phuong  play football very well