说明
learn of/learn off
learn to do/learn how to do
核心问题
（1）He is learning to swim. （2）He is learning how to swim.
请问上面哪个句子是正确的？
词典解答
上面两个句子都是正确的。只是 learn how to 后跟的都是动作动词,而且强调所学习的是一种技能或方法:
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She is learning to be a dancer. (不能用 how to be a dancer) 她在学习舞蹈, 想成为舞蹈家。
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Have you learnt how to ride a horse yet? 你已经学会骑马了吗？