Already, still, always and yet are words that are often used incorrectly by learners of English. 

ALREADY

  • Already is used to say that something has happened earlier than expected or
    earlier than it might have happened :
    • Hurry up Susan. Breakfast is ready!
    • I’ve already had breakfast thanks. I woke up early.

STILL

  • Still is used to refer to continuing situations.
    • They’ve been married for 40 years and they still love each other.
    • I moved to this town five years ago and I’m still living here.
    • Are you still smoking? I thought you had stopped!

ALWAYS

  • Always is used to refer to something that happens regularly, very frequently
    or forever.
    • I always send cards at Christmas.
    • Sue always takes the 8 o’clock train to work.
    • Alex is always complaining about his job.
    • I will always love you.

YET

  • Yet is used to ask if something expected has happened, and in negative sentences.
    Questions:
      • Has the postman arrived yet?
      • Have you finished the book yet?
  • Negative sentences:
    To say that something hasn’t happened so far, or up until the present .
    • The book I ordered hasn’t arrived yet.
    • We have yet to find out the cause of the delay.
      (=We still haven’t found out the cause.)
  • Yet can also be used to link two clauses or contrasting ideas
    (in the same way as, for example, ‘nevertheless’ or ‘nonetheless’).
    • She was offered an interesting job with good pay. Yet she refused it.
    • He felt alone in the world, yet he was surrounded by friends.
    • He was a strict yet fair teacher.