Háizi zài zhè tiáo hé lǐ yóuyǒng tài wéixiǎnle. S 。
This river is dangerous for children to swim in.
Yóuyǒng shǐ tuǐ bù qiángjiàn. S 。
Swimming makes your legs stronger.
Wǒmen jìnqíng zài hú lǐ yóuyǒng. S 。
We enjoyed swimming in the lake.
S 。
She taught me how to swim.
Wǒmen zài hú lǐ yóule yǒng. S 。
We swam by the lake.