As you look at the pattern of + and – signs you have placed in the chart you will probably find it matches the following descriptions .
When people learn language at work, in social interaction or in the playground their experiences are often quite different from those of learners in classrooms.
In natural acquisition setting
-language is not presented step by step. Natural communicative interaction, the learners is exposed to a wide variety of vocabulary and structures.
-learners errors are rarely corrected. If their interlocutors can understand what they are saying, they do not remark on the correctness of the learners speech. They would probably feel it was rude to do so.