他的理解力很强。
He's quick on the uptake. *这是一种固定说法，表示“理解吸收能力强”。
He's a fast learner.
He has a quick mind.
He catches on quickly.
他不会让你失望的。
He'll never let you down. *let down“使人期待落空”。
他很能干。
He's efficient. *efficient“有效的”、“效率高的”、“工作出色的”、“能力强的”。
He finished the job already. (他早就把工作做完了。)
He's efficient. (他真能干。)
He does things well and he gets them done quickly. (他工作起来又好又快。)
He gets things done efficiently. (他做事很有效率。)
He handles things quickly. (他处理事情很麻利。)
He handles matters promptly. (他处理事情很利索。)
他是个好人。
He's a good guy.
He's a good man.
He's a good person.