The Adverbs of Time

since -for-before-already-just-never-yet

Since, when used with the present perfect tense, means from a point or period of time in the past up to now.

• I have lived here since my childhood.
• I haven’t seen him since last week.
• India has made tremendous progress since the dawn of independence.
• I have been a student since 1990 
• We have taught at this school since 1965.
• Alice has been married since March 2nd.
• They have been at the hotel since last Tuesday.

For, when used with the present perfect tense, refers to a period of time up to now.

• We have lived here for twelve years.
• He has been working here for three years now.
• The strike has continued for two weeks.
• She has lived here for twenty years.
• We have taught at this school for a long time.
• Alice has been married for three months.
• They have been at the hotel for a week.

Before is used when you date back from any point of time in the past or future.

• The roof must be repaired before the rain starts.
• I think I have seen him before.
• He´s been to New York before.
• He hasn´t been to Boston before.
• Has your daughter used a laptop before?
• She´s climbed Grouse Mountain before. 

Yet can be translated by  "aún" or "aún" in Spanish. His usual position is at the end of the sentence. It is used to indicate that something has not happened until the present moment.

• We are not there yet.
• Wait! I'm not ready yet. 
• No, I haven't talked to her because she isn't here yet.
• Have you toured Quito yet?
• Have you paid yet?
• I haven't paid yet.

 Already means 'already' in the terminative sense of the adverb. We use it to indicate that something has already happened or was already happening before the moment to which we refer.

• Have you already been to Berlin? 
• Yes, I have already been there twice. 
• We already knew he was coming to visit.
• I have already done my homework 
• Has she already been to the top of the Eiffel Tower?
• We've already seen the Great Wall. 
• My friends have already gone snorkeling. 

Ever is used a lot in questions. The point of these questions is to know if you ever do or have done anything in particular. 

• Has he ever seen Titanic?
• Have you ever been to Paris? 
• Have your parents ever been to Germany?  
• Did you ever visit me in my old flat? 
• Did you ever meet Lisa’s grandmother? 
• Will you ever forget me? 
• Are you ever going to finish this housework? 

Never is used in English to make denials. Like ever, it can be used in both Present Simple and Present Perfect. 

• You never listen to me! – ¡Tú nunca me escuchas!
• I never go to the theatre, it’s so expensive 
• My grandfather never travels. He prefers to stay home  
• I’ve never been to Rome 
• He’s never met Mary. We should introduce them  
• I’ve never read The lord of the rings. It’s too long 
• They had never seen such a beautiful sunset before  
• I never met Nick’s grandfather. It’s a pity 
• I never visited you in your old house. I never had time  
• I never saw such a big fish before 
• I’ll never go back to that cafe. The service is terrible 
• I’m never going to understand algebra. I hate math 

Just is most commonly used as an adverb together with the present perfect tense. In this context, just means ‘a short time ago’, and is positioned between the auxiliary verb (had/ have/has) and the past participle.

• I’ve just spoken to John.

• Have you seen what’s just happened to the share price?

• They had just finished their dinner when the phone rang.

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