Newspapers are guardians of the written word -- the perfect place to look for how professionals use subjects and verbs. Choose a story that interests you. Read the headline and identify the subject and the verb. Look at the lead paragraph and analyze how the headline subject is reflected in the opening paragraph. Continue reading through the story, and look for how the reporter develops the subject and the different ways he refers to the same person or object to avoid awkward repetitions. Consider whether the verbs he uses are power verbs or passive verbs and which kind of verb makes for more compelling reading.
Musicians often take liberties with grammar in expressing themselves artistically in song. Analyze the lyrics of some of your favorite music to find where the artist departs from traditional grammar, such as verbs that don't agree in number or person with the subject. Discuss whether the artist did this on purpose and what she was trying to accomplish by going outside the traditional grammar rules in the song.
Write complete sentences on 3-by-5 cards, and cut them apart between the subject phrase, which names the person, place or thing the sentence tells about, and the predicate, which contains the action word, or verb, that tells what the subject is doing. Shuffle the cards and take turns drawing and trying to match a subject with a predicate, making sure the subject agrees with the verb even if the sentence is silly.
In the same vein, you can try a homemade Mad Libs game. Make at least 100 word-cards for all the different parts of speech. Draw 10 cards and try to form a complete sentence. Sentences must be grammatically correct with a subject phrase and a verb phrase, but the meaning can be nonsensical. If you can't make a sentence, discard two and draw two cards on each turn until you can make a complete silly sentence.