@Smarty11,
Quote:1)"I have been preparing food all day long and now I have prepared it",
11, in colloquial everyday chat: “...but now I’m done” or “...and now it’s ready"
Quote:"I had been preparing food for 6 hours yesterday (today), and now I have prepared it"?
Subtle difference: ”I had been preparing” suggests that your work had somehow been interrupted but maybe you resumed it today: “...when Mom insisted I quit, so this morning I finished up"
Quote:Does the meaning change in these two sentences if we say" ... I have prepared it by now"
Also subtle diff: “by now” suggests you had plenty of time for the job and could even have even finished earlier. You might say, “....so by now it’s ready."
Quote:or "I have prepared it just now”?
No. we’d say “I finished just now"
Quote:Can we use the pres. perf. with "now", "just now", "just", "by now” ........?
//////the pres. perf. with "today”?.......
Sm, I’m no linguist but maybe this will help
http://onelook.com/?w=present+perfect&ls=a
11, slight differences in construction often indicate what I’ve called “subtle” differences in meaning. Hang in there, it takes years to catch on; though many of use never reach that pinnacle of achievement
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