Many teenagers study hard.是属于什么句型的?

Many teenagers study hard.是属于什么句型的? They 什么 study hard We must study hard做句型转换 study hard 的用法 什么you 什么study hard 句型转换 I study hard so that I can pass the exam I study hard _ 连词成句smoking is a teenagers serious a study shows many Chines study hard的同义句 句型转换：Do you study hard?(from now on) many teenagers feel that study hard study very hard 用什么替换