你們是什麼時候開始戴隱形眼鏡的呀？

When did you start using contact lenses?

When did you start wearing contact lenses?

Source: Tatoeba

Sentence Composition

1 你們 nǐmen you (plural)
=2 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=2 是 shì variant of 是 shì
3 什麼時候 shénmeshíhou when?; at what time?
4 開始 kāishǐ
  1. to begin
  2. beginning
  3. to start
  4. initial

classifier: 個
=5 戴 Dài surname Dai
=5 戴 dài
  1. to put on or wear (glasses, hat, gloves etc)
  2. to respect
  3. to bear
  4. to support
6 隱形眼鏡 yǐnxíngyǎnjìng contact lens

classifiers: 隻, 副
=7 的 de
  1. of; ~'s (possessive particle)
  2. (used after an attribute when it modifies a noun)
  3. (used at the end of a declarative sentence for emphasis)
  4. (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂兒的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one")
  5. also pr. dì or di in poetry and songs
=7 的 dī a taxi; a cab (abbr. for 的士 dīshì)
=7 的 dí really and truly
=7 的 dì (bound form) bull's-eye; target
=8 呀 yā
  1. ah (used to express surprise)
  2. (onom.) creaking
=8 呀 ya (particle equivalent to 啊 after a vowel, expressing surprise or doubt)