_f.
:(4) Did you see a grey dog or a grey cat? I saw a grey [DOG] _f.
:(5) Did you see a grey dog or a black dog? I saw a [GREY] _f dog.

The question/answer paradigm shown in (3)-(5) has been utilized by a variety of theorists to illustrate the range of contexts where a sentence containing focus can be used felicitously. Specifically, the question/answer paradigm has been used as a diagnostic for what counts as new information. For example, the focus pattern in (3) would be infelicitous