can not(缩写)can't right(反义词)left/wrong buy(同音词)by/bye sea(同音词)see first(基数词)one four(序数词)fourth did(原形)do/does three(序数词)third give(过去式)gave too(同音词)to/two go(反义词)come foot(复数)feet child(复数)childre