1. Let's join a rowing club.
我们加入划船俱乐部吧。
还能这样说：
Why not go to join a rowing club?
What about joining a rowing club?
谚语：
To look one way and row another.
声东击西。
2. We shall go boating on the lake on Sunday.
我们周日要到湖上去划船。
还能这样说：
We will row a boat on the lake on Sunday.
We intend to go boating on the lake on Sunday.
应用解析：
Lake Victoria 维多利亚湖；
the Great Lakes 五大湖；
by the lake 在湖畔；
the Lake District 湖区
3. You must learn to row.
你要学会划船。
还能这样说：
Can you row a boat? If not, you'd better learn it.
You'd better learn how to row a boat.
谚语：
Fools learn nothing from wise men, but wise men learn much from fools.
愚者不学无术，智者不耻下问。
4. May I have the use of your cockboat?
我可以借用一下您的小艇吗？
还能这样说：
Would you be kind to lend your cockboat to me?
Can you lend me your skiff?
应用解析：
be of great use 非常有用；
use sb. well 对人好；
use care 小心；注意；
use economy 节省；
in use 正在用；通用