Jim couldn't go to school these days.We are worried about him.
Mary thinks he didn't have enough (sleeping )because he （goes ）to bed very late every day.I (think) he might be too stressed out because he (feels) tired every day.Our teather said he might have a cold because he had a fever on Friday.
可以把现在的人想的动作用一般现在时,他以前做的事用过去式.而且每天做的事表示一种习惯,要用一般现在时.（括号里为修改的内容）