D. We use ‘for’ to say how long.
D1. use ‘since’ with the present perfect or the past perfect to say when something started.
D2. use ‘from ~ to/ until’ to say when something starts and finishes.
E. We use ‘still’ to show that something continues up to a time in the past present or future. It goes in front of the main verb. or after the present simple or the past simple of be. (e.g. Her grandfather is still alive.)
E1. use ‘already‘ to show that something has happened sooner than it was expected to happen. Like still, it comes before the main verb. (e.g. The car is OK. I’ve already fixed it.) or after the present simple or past simple of the verb be.
E2. use ‘yet‘ in a negative or interrogative clause, usually with perfective aspect (especially in British English), to show that something has not happened by a particular time. ‘yet’ comes at the end of the sentence.