我不会讲英语，更不用说德语了。

I cannot speak English, much less German.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
2 不会 bùhuì
  1. improbable
  2. unlikely
  3. will not (act, happen etc)
  4. not able
  5. not having learned to do sth
  6. (coll.) (Tw) don't mention it
  7. not at all
3 讲 jiǎng
  1. to speak
  2. to explain
  3. to negotiate
  4. to emphasize
  5. to be particular about
  6. as far as sth is concerned
  7. speech
  8. lecture
4 英语 Yīngyǔ English (language)
5 更不用说 gèngbùyòngshuō let alone; not to mention; much less
6 德语 Déyǔ German (language)
=7 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=7 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)
=7 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=7 了 liào unofficial variant of 瞭 liào