Dont be Tense (d)

Tenses were  taught only with the intention of focussing on time .Actually there is more to it than the sense of time if one were to go deep into the usage irrespective of the time . One can also use the  " Will " supposedly used for the future tense to express a feeling in the past as .....My grandma will sit by the door ,in her wheel chair , waiting for me until I return .