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Your friend just bought a brand-new acoustic guitar and wants to know what to expect. Select ALL the grammatically correct questions your friend could ask you.
The correct answers are How long does it take to learn the guitar? and How long does it take to play a simple song?
Always use the base verb (infinitive) with "to" after "take" in this phrase: How long does it take to learn...
We do not add an "s" to the main verb ("takes") when we already have "does" in the question, and we don't use the "-ing" form ("learning") here.