解析：

1. ability 為名詞,能力、才能、天分的意思；指人表現(xiàn)出來的的實(shí)際能力,既指天賦能力,也指培養(yǎng)造就而獲得的本領(lǐng).e.g. We found him work more suited to his abilities.

2. able 為形容詞,能夠、有能力的的意思,只用于褒義；做種做事的能力.e.g. He is an able man. 他這個(gè)人很能干.常用短語為：be able to do sth.

3. skill 為名詞,技能、技術(shù)的意思；指人經(jīng)過學(xué)習(xí)掌握的技能和本領(lǐng),可通過他的形容詞幫助理解--skilled （有技巧的、熟練的）.e.g. He mastered a lot of skills through training and became a skilled worker in his office.