Do you speak English?

Are ‘Do you speak English?’ and ‘Can you speak English?’ interchangeable?

to speak English Vocabulary play the main role…

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Strictly speaking, “can” asks about ability, and “do” askes about general habit/behaviour, but in practice “do” has developed as a polite way of asking about ability, and is the more usual form when asking a stranger, for instance.

In other contexts there is a difference in meaning. For example, “Do you speak English at work?” (customary behaviour) versus “Can you speak English at work?” (permission/possibility).