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Many authors generalized the concept and used binary relations to approximate a set. In this paper, we used soft binary relations to approximate a set. We approximate a set by using the aftersets and foresets. In this way we get two sets of soft sets, called the lower approximation and upper approximation with respect to the aftersets and foresets. We applied these concepts on semigroups and approximations of subsemigroups, left (right) ideals, interior ideals and bi-ideals of semigroups are studied. Moreover, some examples are considered to illustrate the paper. 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