They are often interchangeable, but there are certain expressions that go with one rather than the other. For example you speak a language.
Also, speak is a little bit more formal.
Hope that helps :)
21 september 2014
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Talk is a two-direction conversation, for example with your friends. Speak is a one-direction conversation, for example a lecturer or radio presenter.
21 september 2014
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!