你累了，最好休息一下。

As you are tired, you had better rest.

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 累 lěi
  1. to accumulate
  2. to involve or implicate (Taiwan pr. lèi)
  3. continuous
  4. repeated
=2 累 lèi
  1. tired
  2. weary
  3. to strain
  4. to wear out
  5. to work hard
=2 累 léi
  1. rope
  2. to bind together
  3. to twist around
=2 累 léi used in 累贅／累赘 (léizhui, “cumbersome”)
=2 累 lǜ only used in 謼遫累／呼遫累
=2 累 liè only used in 肥累
=3 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=3 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 無 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 瞭 liǎo)
=3 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=3 了 liào unofficial variant of 瞭 liào
4 最好 zuìhǎo
  1. best
  2. had better ...; it would be best to ...
5 休息 xiūxi
  1. rest
  2. to rest
6 一下 yīxià
  1. (after a verb) a bit; a little (indicating brief duration, or softening the tone, or suggesting giving sth a try)
  2. all at once; suddenly