Just speak as you always do, and your child will figure it out on his own. Before age 3, children use speech primarily to get what they want or need. As pronunciation becomes more accurate, grammar also continues to get more precise. Keep in mind that there will be some normal setbacks. Many children also start to use sentences with two verbs around this time, although they're not experts until they're 4.
Children now begin to more consistently use language correctly.
And by age 5, most children can manipulate the language, going beyond developing vocabulary and sentence structure to being able to use language to express feelings and thoughts in conversation. It's a miracle how it all happens, says Frascatore. But if talking is delayed beyond that point, consider seeing a specialist. By age 3, strangers still can't understand his pronunciation, or he speaks using only simple two-word phrases. By age 5, he isn't able to tell a short story, talk about the past and future, or ask questions.