Since - For . English grammar practice.

● Since - Starting point of time.
When something started in the past and continues till now. Since is generally used in present perfect tense and present perfect continuous tense.

Examples. - since Thursday
- since 6 o'clock
- since morning
- since February
- since 2021
- since I left the
office.

● For - Duration of time .
- Period of time.

When we measure the duration of something or how long it lasts. For can be used in different tenses.
Examples - for six minutes
- for two hours
- for twenty years
- for three months
- for two centuries
- for six days