“>”=“优于”
can/be able to > ability of sb. to do (one's ability to do sth.) > capable of doing > capability to do sth.
can 强调事物的可能性;could 是 can 的一般过去式。
be able to 强调人所具备的能力,不能用被动语态 (be able to be done ×) OG243
-able构成的形容词,应该表达事物的特征,
cannot be done 或 could not be done 是动作的强调,原来是动作的强调,就应用原来的动作强调。
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