Cummins' distinction between BICS and CALP is important for ELL teachers because:
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A
Students may be conversationally fluent but still lack academic language proficiency needed for grade-level work
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B
BICS develops more slowly than CALP in most ELL students
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C
CALP skills transfer less readily across languages than BICS
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D
Students with strong BICS never develop strong CALP