Dear Xiaowen,
I hear that you have a younger sister now and you face some problems because of her. Here is my advice for you.
First, you should understand your parents.They have to take care of your younger sister because she is too young to look after herself.
Also, sharing things with others is a happy thing. You need to be generous enough to share everything with your younger sister.
What's more, you should try to calm down when your younger sister is crying. You can also close the door of your study, or you can go to your friend's home to do your homework.
I hope you think my advice is worth taking.
Best wishes!
Tingting
【高分句型】
1. They have to take care of your younger sister because she is too young to look after herself.
情态动词的使用：have to;
原因状语：because+原因
表达照顾：take care of; look after.
表达“太...而不能...": too... to do
2. You need to be generous enough to share everything with your younger sister.
情态动词的使用：need to;
表达”足够...去做..." : ...enough to do sth.
表达“与...分享”： share...with...
3. What's more,you should try to calm down when your younger sister is crying.
表达“递进关系”： what's more,
时间状语从句：when+从句
