你可以關燈嗎？

Could you turn off the lights?

Source: Tatoeba

Sentence Composition

=1 你 nǐ you (informal, as opposed to courteous 您 nín)
=1 你 nǐ you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
2 可以 kěyǐ
  1. can
  2. may
  3. possible
  4. able to
  5. not bad
  6. pretty good
3 關燈 guāndēng to turn off a light
=4 嗎 má (coll.) what?
=4 嗎 mǎ used in 吗啡 mǎfēi
=4 嗎 ma (question particle for "yes-no" questions)