I have thought about '2nd language environment'.

- Children can learn 2 or more languages in their environment -- and learn well

- When people are in another language environment -- they learn (from necessity?)

- How often and how much time in a 2nd language environment (to learn the language)?

-- From children case examples: 3-4 continuous hours ==5 days a week==

-- Full and total exposure sessions work very well

- Language is "sound" (vocal, not written words, not grammar but voice manipulation)

- Language is to understand the sounds, and to make sounds to tell others

- Grammar is 'patterns': we use patterns or constructs like we use 'slang'

How do we create this environment?

- to exclude interferences, distractions and 'drift away' (losing focus)

- to fill the environment with 2nd language sounds and use pictures, drawings, tags/labels, ONLY as "clues" (visual "aids" are TOOLS to help us to hear better, to understand the meaning of SOUNDS better -- not to draw scenes away from SOUNDS).

- Audio tools are available on videos, the Internet, in persons, ... to verify the 'correct sounds'.

Good luck ;-)