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keystone
UK
/ˈkiːstəʊn/
US
/ˈkiˌstoʊn/
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Explain the literal and figurative meanings of “keystone” with examples.
Compare “keystone” with “cornerstone,” “foundation,” and “key element.”
Show common collocations with “keystone” and explain how they’re used.
Give five B2-level example sentences with “keystone” and Russian translations.
Explain how “keystone” can be used as a noun or an adjective.
Ask me three questions to check my understanding of “keystone.”
Give me a short exercise using “keystone” in both its architectural and figurative senses.
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