楼主您好！
①buy-buying 除了这个外还有许多直接加ing形式的。比如：go-going, work-working, study-studying, look-looking，do-doing,eat-eating,play-playing,read-reading,wash-washing,plant-planting,borrow-borrowing,pick-picking,paint-painting,cry-crying,took-tooking (v.拿，占领，接受） climb-climbing
②sing-singing
③she-her
④five-fifth。注意five的序数词的变化是不规则的。
⑤is not=isn't
祝你学习进步！每天开心！不懂再问哟
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