When you are filling sick,you know that someone will be their to look after you

错误是 filling 跟 their
应该用的词是 feeling 跟 there

答案应该是
When you are feeling sick, you know that someone will be there to look after you..

当时觉得不舒服的时候,你知道在那时候会有个人照顾你...

filling改为feeling，their改为there

感觉不舒服应该是feel sick 不是 fill sick
在那里应该是be there 不是 be their
修改后应该是：
When you are feeling sick,you know that someone will be there to look after you.