What are some activities you could do with a student whose L1’s sound system you really don’t know?

Please answer these questions
1) How can studying phonetics and sounds that are/are not produced in other languages help you teach languages?
2) How would you teach students the importance of suprasegmental features?
3) How can acoustic phonetics inform our understanding of how to teach languages?
4) What are some activities you could do with a student whose L1’s sound system you really don’t know?

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