She don‘t do her homework on saturday. My sister going to le

She doesn't do her homework on Saturdays.
1、she是第三人称单数,要用助动词does.
2、因为does用于一般现在时,一般地、现在时表示经常发生的事,所以Saturday用复数.
3、Saturday要大写.
4、这句话也可以改成一般过去时：
She didn't do her homework on Saturday.她星期六没做家庭作业.
My sister is going to learn English next year.
1、be going to是“打算”、“将要”的意思.后面接动词原形.
2、English是专有名词,要大写.

She doesn't do her homework on saturdays.My sister is going to learn English next year.

She doesn't do her homework on saturday.My sister is going to learn english next year.

don‘t 改为 doesn't
going to 改为 is going to