to be upset about something that cannot be changed
estar molesto por algo que no se puede cambiar (estar molesto por algo que no se puede cambiar)
"There's no use crying over spilled milk."
"No sirve de nada llorar sobre la leche derramada." (No sirve de nada llorar sobre la leche derramada.)
to have an interest or investment in something
to agree with someone
good things are coming ahead
to appear happy and cheerful
to think creatively beyond structured systems or programmed...
the economic factors affecting the supply and demand of good...