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