When a family member is sick = Whenever a family member is sick = At any time that a family member is sick _______________ I go along = I always go along at that time _______________ When a family member has been sick = Whenever a family member has been sick on some occasion in the past = At any time that a family has been sick on some occasion in the past _______________ I have gone along = I have always gone along on that occasion _______________ In the first sentence you have the present tense. You are talking about a practice that is currently in effect. In the second sentence you have the present perfect tense.
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