Sentences in my class and on art and crafts are prepositional phrases that identify the class and its purpose. These questions are also singular, although they speak of a group of people. Here is an example of a sentence that contains a singular grammatical subject: if you connect the information in a single sentence in commas, the subject of the sentence is what is mentioned before the first comma. A. Itinerary: Choose the appropriate verb from these sentences. 15. Mathematics (is, are) John`s favorite subject, while civics (is, are) Andreas` favorite subject. Be sure to ignore nouns in prepositional sentences and adapt the main verbere in number with the grammatical subject of the sentence.