你該減肥了，因為你太胖了。

You should lose weight, because you are too fat.

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 該 gāi
  1. should
  2. ought to
  3. probably
  4. must be
  5. to deserve
  6. to owe
  7. to be sb's turn to do sth
  8. that
  9. the above-mentioned
3 減肥 jiǎnféi to lose weight
=4 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=4 了 liǎo
  1. to finish
  2. (used with 得 dé or 不 bù after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as 无 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 了 liǎo)
=4 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=4 了 liào unofficial variant of 瞭 liào
5 因為 yīnwèi
  1. because
  2. owing to
  3. on account of
=6 你 nǐ you (informal, as opposed to courteous 您 nín)
=6 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.)
=7 太 tài
  1. highest
  2. greatest
  3. too (much)
  4. very
  5. extremely
=7 太 tā
  1. (Korean Classical Chinese) soybean
  2. (obsolete on its own in Standard Chinese) only used in 太末
  3. only used in 太末
  4. soybean
=8 胖 pán
  1. healthy
  2. at ease
=8 胖 pàng
  1. fat
  2. plump
=9 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=9 了 liǎo
  1. to finish
  2. (used with 得 dé or 不 bù after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as 无 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 了 liǎo)
=9 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=9 了 liào unofficial variant of 瞭 liào