Compléter first conditionalVersion en ligne first conditional par John E 1 American will go something examples happen think start trying If will won't Law Here take only what examples What surprisingly Edward wrong reputation forget IT ALWAYS HAPPENS ! you are in a check - in line and you change to another line that is moving more quickly , happen ? The line you were in before suddenly moving faster . will happen if you your umbrella because you it's going to rain later ? It rain , of course . It will rain if you to take your umbrella . These are of Murphy's Law , which says , " If there is that can go , it will wrong . " Murphy's took its name from Captain Murphy , an aerospace engineer from the 1940s . He was to improve safety for pilots flying military planes . Not , he got a for always thinking of the worst thing that could in every situation . are some more of Murphy's Law .