Since, Until and For to Show Continuation

Step 1:Learn Key Sentences	a) She has been here since 2 o'clock.b) We will be here until 4 o'clock. c) They have been here for two and a half hours. d) They will stay for one more hour.
Step 2:Learn How to Use	Use since with have been plus a time or a day.Use until with the future tense (usually) - will or be going to- plus a time or a day. Use for with have been or the future tense plus how long (how much time).
Step 3:Learn Sample Conversations	Conversation using Since A: How long have you lived here, Mary? B: I've lived here since June 1st. Conversation using For A: Hi Bob, sorry to keep you waiting B: That's okay, Alice, I have only been here for a few minutes. Conversation using Until or For A: So, you will stay until next Sunday, is that right? B: Yes, we will be here for just ten days.