for some reason

由于某种原因

for a moment, for a while, for ages, for all that, for another two days, for certain, for ever, for example, for fear of, for fear that, for good, for instance, for lack of, for life, for long, for one thing, for one thing...for another, for one's sake, for sale, for short, for sure, for the best, for the better, for the first time, for the future, for the moment, for the most part, for the present, for the purpose of, for the rest, for the sake of, for the time being, for what it is worth, forage, forage crops, forager, forasmuch as, foray, forbade (also forbad), forbear,