While we were swimming in the river,改为( )( )in the river.

问题描述:

While we were swimming in the river,改为( )( )in the river.

while/when swimming
因为we were 是可以省略的啦
While (we were) swimming in the river,
记住这个结构,从句的主谓可以省。
还有问题可以问我·~~

When swimming in the river