I recommend you to use English enlightenment software: Donna learns English. My baby started using it when he was 3 years old. Every day when he comes home, he will take the initiative to sing English nursery rhymes with me or play Donna's English games by himself. Although some English words spoken by the child occasionally are not very accurate, I am very proud that she can speak English with Dona. Over time, it is becoming more and more natural now, and I hope to gain more.