No students in my class can speak english as fluently as Lan does =>Lan

No students in my class can speak english as fluently as Lan does

=>Lan speaks English the most fluently in my class.

Form : S+V+the+ most +adv+.......

ngoài ra còn có cách viết khác như sau : 

Lan is the most fluent English speaker in my class.

form : S+be+the+most+adj+N+......