The more students are active constructors of language rather than passive receivers the better. Have students develop and use their own sentences in authentic and meaningful communication as much as possible. Use social, cultural and intellectual contexts to learn the language. Do not worry too much about mistakes and do not make the children too much worry about them. People make many mistakes learning a second language.
Students usually correct their mistakes with more exposure and use.
Some mistakes though, will need to be corrected in a systematic way. Learning a language involves learning a culture and way of thinking. Culture is learned more through experiences than discussion. Feeling positive toward a culture and language can help language learning. Language affects thinking.