Answer:
You use a knife to slice my head but you weep beside me when I am dead
Some will use me, others not. Some have remembered, others forgot. For profit or gain, I'm used expertly. I can't be picked off the ground or tossed into the sea. What am I?
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
I am the beginning of eternity the end of time and space the beginning of every end the end of every place.
The faster you run the harder it is to catch me
What is always coming but never arrives?