In order to catch up with my classmates.I must study hard.改同义句I study hard-------I can catch up with my classmate.

问题描述:

In order to catch up with my classmates.I must study hard.
改同义句
I study hard-------I can catch up with my classmate.

I must study hard to catch up with my classmates.
I must study hard, so that I can catch up with my classmates.

I must study hard so that I'll be able to catch up with my classmates.

2楼的正确

I must study hard so that I can catah up with my classmates.

I must study hard [so that] I can catah up with my classmates.

正确