【英文文法】通用關係代名詞 that 使用時機

I saw a young lady and her cat that were sitting on the bench.
我看見一個年輕女士和她的貓坐在板凳上。

This is the most touching scene that I have ever seen.
這是我看過最感人的畫面了。

Martha is the first Italian that I have ever met.
瑪莎是我遇到的第一個義大利人。

Who is the boy that is drinking water on the field?
那個在球場上喝水的男孩是誰？

Taking the exam took all the energy that I had.
考這場考試耗掉我所有的精力。

Larry, who is a lawyer, can play golf well. (O)
Larry, that is a lawyer, can play golf well. (X)
賴瑞是個律師，他很會玩高爾夫球。

He knows the girl to whom Daniel is talking. (O)
He knows the girl to that Daniel is talking. (X)
他知道那個正在和丹尼爾講話的女孩。

God helps those who help themselves.
天助自助者。