foot是可数名词;
foot
n.(人或动物的)脚,足;有…脚(或足的);有…只脚(的);用…脚(或足的);(袜子的)足部;
v.走,踏;合计,结算(up),加(to),支付;
第三人称单数: foots;
复数: feet;
现在分词: footing;
过去式: footed;
过去分词: footed
She shifted her weight from one foot to the other.
她把身体的重量从一只脚换到另一只脚上。
He moved restlessly from one foot to another.
他的两只脚不停地倒替着。
It was the first time I had set foot on American soil.
那是我第一次踏足美洲大地。