He can't believe he will catch up with others ,will he /can

i don't believe he can catch up with me,--------?为什么用can't h __he works hard,__ he can't catch up with others 1.___hard he studies,he can't catch up with his friend in En he runs so fast i can't catch up with him.（改为同义句） He can't decide when will start 单句改错If he will get up late,he can't eat breakfast If he will get up late,he can't eat breakfast.改错 When your classmate can't catch your meaning,what will he sa 英语 If he ________ harder,he will catch up with us soon.A.stu If he ___ harder next time,he will catch up with us. 30.If he __harder,he will catch up with us soon. He decided to catch up with others （同义句）