I think proper study habits can make us study long time. If I have bad study habits, I will get tired early, don't do well in memorizing, and have a trouble with understanding what I learned.

Hello, Henry!
Thank you for answering with very insightful thoughts. Keep up the good work!
~Teacher Selene. 

I think proper study habits can make us study long time. 
>>I believe that proper study habits can help us retain information better. 
If I have bad study habits, I will get tired early, don't do well in memorizing, and have a trouble with understanding what I learned.
>>If my study habits are bad, I will end up getting tired easily, and have difficulty in memorizing and comprehending what I have learned.