I can't speak English. 我不会英文
I can not speak English very well. 我英文讲得不好
I'm not good at English. 我不善用英语/我英文不好
I am chinese and I can't speak english.
If I not speak english, I am speaking.
I can't speak english.
I can't speak english, let alone french or german.
I entered laos without any knowledge about the country; I spoke no english and had no clue where my family had been taken.