● Since - Starting point of time.br When something started in the past and continues till now. Since is generally used in present perfect tense and present perfect continuous tense.br br Examples. - since Thursday br - since 6 o'clock br - since morning br - since February br - since 2021br - since I left the br office. br br ● For - Duration of time .br - Period of time. br br When we measure the duration of something or how long it lasts. For can be used in different tenses.