就目前的这些内容,更正如下：
Dear dad,you are (so) busy every day that you do not pay much attention to your health.I (was改成am) worried about you.I hope you can keep (health改成healthy).You often drive to (you改成your) office.It is not far...
另：第一处错误也可以直接在day和that中间加上so.