it is

"have"


not


"of"


as in - " i should have put up a 4m kite to handle the 40 knot wind gusts that the cyclone was producing"


not " i should of correctly measured the wind speed before claiming i was kiting in 60 knots of wind in Townsville today - just because it feels windy does not mean i can randomly make up large numbers and apply that arbitrary label to the wind speed i believe there to be "