He swims in the river every day .swim后面为什么加s

He swims in the river every day .swim后面为什么加s he swims in the river every day.(用 按要求改写下列句子 1.He swims in the river every day ..(用 tomorrow改写) He often swims in the river in s--- 快 The litter boy can swim (swim swims )in the river he often (swim)or(swims)?in the river when the summer comes. 1.He often( )in the river.A.swim B.swims C.is swimming The little boy can____(swim swims)in the river. He swims in the river变为一般疑问句 He often swims in the river.用yesterday改写句子 let's (swim) in the river swim是不及物动词 那它加上了介词就可以带宾语吗.好像He always swims in the river这句话有