1 year ago
Last edited at 10:32PM on 10/14/2012
"I've" is the suffix for "I have" or contraction as my English professors would refer to it. professional/formal writers actually prefer it if you don't use contractions. I have sounds better than "I've".
I'm assuming that you're referring to past tense or subjunctive clauses. It really depends on many factors. For instance, you can say "I saw" or "I have seen" and they will mean basically the same thing... but depending on the context in which they are used, they can be marginally different. You would say "I saw an old friend the other day" (as in one instance of seeing that friend) but you would say, "I have been seeing an old friend for lunch" if it were ongoing. "I have" is used mainly in the subjunctive tense, I (and then the past tense verb) is used for past tense.
"I am reading a book now. " and "I've been reading this book for an hour now. " , "What am i doing ? " and "What've i been doing ?" , "I've been a teacher for a decade now , and i've had enough . I am going to be a professional lecturer tomorrow " I hope you can see the difference :DD