你母親年輕的時候一定很美。

Your mother must have been beautiful when she was young.

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 母親 mǔqīn
  1. mother
  2. also pr. mǔqin

classifier: 個
3 年輕 niánqīng young
=4 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 跑堂儿的 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
=4 的 dī a taxi; a cab (abbr. for 的士 dīshì)
=4 的 dí really and truly
=4 的 dì (bound form) bull's-eye; target
5 時候 shíhou
  1. time
  2. length of time
  3. moment
  4. period
6 一定 yīdìng
  1. surely
  2. certainly
  3. necessarily
  4. fixed
  5. a certain (extent etc)
  6. given
  7. particular
  8. must
7 很 hěn
  1. very; quite
  2. (also, often used before an adjective without intensifying its meaning, i.e. as a meaningless syntactic element)
=8 美 Měi
  1. (bound form) the Americas (abbr. for 美洲 Měizhōu)
  2. (bound form) USA (abbr. for 美国 Měiguó)
=8 美 měi
  1. beautiful
  2. very satisfactory; good
  3. to beautify
  4. to be pleased with oneself