the students are working very hard at their lessons改为同义句什么 什么 the student are working at th

the students are working very hard at their lessons改为同义句什么 什么 the student are working at th
the students are working very hard at their lessons改为同义句什么 什么 the student are working at th

the students are working very hard at their lessons改为同义句什么 什么 the student are working at th
( How hard ) the student are working at their lessons .

All of the students are working very hard at their lessons