Must is absolute; there is no choice. We must catch the next train (to arrive in time)
Could is conditional; there is a choice. We could catch the next train (if there is no need to arrive before a given time).
Could can also be used in place of 'would' for a polite request. Could you open the door please.
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I must go = Je dois aller
I could go = Je pouvais aller/Je pourrais aller
As you can see, the meaning is very different!
30. September 2014
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