A 2 year old may know 200 to 300 words and he will begin to speak short sentences. You may hear, “No!” and “Me do it!” a lot. One or two words will stand for many things. “Mommy” may mean, “Where’s Mommy?” or “Mommy, play with me.” or something else entirely. It’s up to you to figure out what he means so be patient and understand this will pass as he learns how to communicate with you.