请大家看一下有无语法错误（英语）

题目

请大家看一下有无语法错误（英语）
there are only 90 days left,what all we can do is fight.
remember,always remember.you are not alone
give yourself a promise,and i konw you will make it.
FIGHT!FIGHT!FIGHT!
那应该怎么说呢？do give yourself a promise有语法错误吗？

答案

There is only 90 days left, and what all we can do is to fight.
remember, always remember. you are not alone.
give yourself a promise, and I am sure you will make it.
FIGHT! FIGHT! FIGHT!
do give yourself a promise没有语法错误