Quote Originally Posted by bitpicker View Post
You can't say "that to file suit be a phrasal verb". It sounds as if you were telling the verb to go and be phrasal.
Is it not the subkunctive? Here is what Grammar In Use (Cambridge) says: "We can sometimes report advice, orders, requests, suggestions, etc. about things that need to be done or are desirable using a that-dause with should + bare infinitive. In formal contexts, particularly in written English, we can often leave out should but keep the infinitive. An infinitive used in this way is sometimes called the subjunctive.".

My sentence was: "My first assumption was also that "to file suit" be a phrasal verb.". Does this sentence not comply with the rule above?
I believe it does not and you were right. But I do not see why I was wrong. It is kind of a gap in my understanding.