我不能幫你了。

I wasn't able to help you.

I couldn't help you.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
2 不能 bùnéng
  1. cannot
  2. must not
  3. should not
3 幫 bāng
  1. to help
  2. to assist
  3. to support
  4. for sb (i.e. as a help)
  5. hired (as worker)
  6. side (of pail, boat etc)
  7. outer layer
  8. upper (of a shoe)
  9. group
  10. gang
  11. clique
  12. party
  13. secret society
=4 你 nǐ you (informal, as opposed to courteous 您 nín)
=4 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.)
=5 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=5 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)
=5 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=5 了 liào unofficial variant of 瞭 liào