The words for, since, and during in English are used with certain verb tenses, specifically present perfect, present perfect continuous and past continuous (although they can be used with other tenses as well). For. The preposition for is used to express the duration of an action; the period of an action or event. For example;
PERMANENT. Depending on the meaning of a verb, an action or state in the present perfect may express permanence. The verb in the present perfect expresses duration of an activity, event or state, which occurred sometime in the past, and (1) may have ended recently, or (2) may continue into the future. The tower has stood in Pisa since 1370.
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present perfect continuous tense since for