✨ ベストアンサー ✨
全体的に大きな文法間違いはないと思います。ただ、it is fun, so ''we'' can keep・・・の方が統一性があってよいと思います。
もっと内容を膨らませて高得点を狙うなら字数制限にもよるけど、
I think studying with friends is better than studying alone.
I have two reasons.
First, we can teach each other when we don’t understand something.
By doing so, we can understand it more deeply.
Second, it is fun, so I can keep studying for a ''long'' time without getting tired.
が良いと思います!
ご丁寧にありがとうございます🙇🏻♀️
参考になります🙇🏻♀️