I am afraid we have to go now的afraid后面为什么不加to或of

Question

如题所述

Answer 1

I am afraid 后省略了of , (that) we have to go now 是介词of的宾语从句
这是一种固定用法。一些be +形容词 +介词的短语，常常省略介词再接that引导的宾语从句。如
be sure of/ about sth, be surprised at sth, be pleased with 等等
I'm sure (that) you are honest
I'm surprised （that) his father is an American
I'm pleased ( that) he finished the task in time.
如果这类短语后接特殊疑问词引导的宾语从句，则不省略介词
I'm pleased with what you said