3.Adverb↑ Liaison is only permitted after adverbial use of trop: when used (pro)nominally (as in the sentence il y en a trop ici), it takes on the quality of a singular noun that prevents liaison with the following word. As it can be difficult to draw an unequivocal distinction between its adverbial and nominal uses, one may prefer to always forgo liaison following trop — even where it is permissible, liaison after trop is not only optional, but also significantly more formal than necessary (or appropriate) for most situations.