Zhèxiē kùnnán nǐ néng bù néng kèfú？
Are you able to overcome the difficulties?
Nǐ huì shuō Hànyǔ ma？
Can you speak Chinese?
Qǐngwèn，wǒ kěyǐ jìnlái ma？
Excuse me, may I come in?
shows the innate ability of some one.
shows that some skills can be mastered after some training.
refers to some permit.
Qián duàn shíjiān，tā dǎ lánqiú de shíhòu，tuǐ shòushāng le。Xiànzài yǐjīng hǎo le，yòu néng dǎ lánqiú le。
Sometime ago, his leg was hurt when playing basketball. He is getting well now and he can play basketball.
能：恢复某种能力(recover some ability)。
Jīntiān xià zhème dà de yǔ，tā néng lái ma？
It is raining so heavily. Will he come?
能：表示有可能。(refers to some possibility)
Tā hěn néng chī。Yí cì kěyǐ chī 8 gè bāozi。
He is a good eater. He can eat 8 steamed stuffed buns every time.
(shows the ability and stresses the quantity.)
Tā hěn huì chī。Nǎlǐ de měishí dōu cháng guò。
He is good at eating. He have tried the delicacies everywhere.
(shows the ability and stresses the quality)
Nǐ_____xiě zhè gè hànzì ma？
Nǐ______bāng wǒ yíxià ma？
Tā______zuò zhè jiàn shìqing ma？
Nǐ___bú ____xiū diànnǎo？
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