这句英语语法对吗I dread to think what would my face look like 20 years later

dread在这里并不适当,这字通常用作形容恐怖的事物，而不是形容感受用的
另外what would my face look like是问句，当你在陈述句中用于形容程度时，是what my face would look like
20 years later是比较口语的用法，建议你用after 20 years.

I dread thinking of what would my face look like 20 years later from now.

小柔正解。

I dread to think what my face would look like。。。 。。。