An actual implicature is any potential implicature that is not canceled by its context.
The expression I think that some went has two potential implicatures:
Of the two potential implicatures, only I don’t know that some went is an actual implicature, because the other occurs in a complement clause that the matrix clause does not entail. If some went were uttered independently, as a main clause, its potential implicature ‘not all went’ would also be its actual implicature.
Levinson 1983 134
Levinson 1983 133–134
Gazdar 1979 55
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