A bit, a little, a little bit.
Are these words synonyms? Can I say "I can speak English a little", "I can speak English a bit", "I can speak English a little bit". All sentence are correct?

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Question:  'Are all those sentences correct?'

Answer: Yes, you can say any of those. You could also say 'I speak a little English' or 'I speak a little bit of English'. 'Bit' is quite informal, but we use it a lot.

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I can speak english a little