The litter boy can swim (swim swims )in the river为什么,后面选swim

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The litter boy can swim (swim swims )in the river为什么,后面选swim
The litter boy can swim (swim swims )in the river
为什么,后面选swim

The litter boy can swim (swim swims )in the river为什么,后面选swim
can后面的单词不用加s