As the financial crisis worsens, his father is worried about that hewould lose his work.
这里的that可以改成whether 吗？变成他的爸爸担忧他会不会扔掉工作，在语法上是成立的吗？谢谢老师们的指教！
As the financial crisis worsens, his father isworried about that he would lose his work.
这是一个错误的句子。that从句不能作介词的宾语（个别介词如in，except, but除外）。假如用that从句，则需要删去介词about。假如用whether，主句一般为否定句。所以二个句子如下：
As the financial crisis worsens, his father wasworried that he would lose his work.
With the financial situation improving, hisfather was no longer worried about whether he would lose his work.