1.who of you by worrying can add a single hour to his life.
2.It is an unusual person who can live free from financial stress, or who can spend money on other as easily as he spends it on himself.这个是强调句。简要说说强调句的用法
who of you（主语）
by worrying（状语）
can add（谓语）
a single hour（宾语）
to his life（状语）
Who of you by worrying can add a single hour to his life ?
你们当中有谁可以通过担忧能给他增加一小时生命呢？
（意思：你们当中又有谁能够借着忧虑多活几天呢？）
2. 强调句：
it + be + 被强调部分 + that + 句子其它部分。（如果被强调的是人，也可以用who）
被强调部分：主语、宾语、表语、状语都可以的。
如：
I saw him in the room yesterday.
It was I who/that saw him in the room yesterday.强调主语
It was him that/who I saw in the room yesterday. 强调宾语
It was in the room that I saw him yesterday.强调状语
It was yesterday that I saw him in the room.强调状语
去掉it was that，句子完整。
将it was/is that 去掉句子仍成立为强调句
句型：强调句的特殊疑问句的形式，that 后面不是加要强调的部分，而是加句子的其他成分。因为已经对被强调部分进行划线提问了。
what is it that + 其他
where is it that + 其他
How is it that + 其他
why is it that + 其他
when is it that + 其他
who is it that + 其他
例如I met him yesterday.
It was yesterday that I met him.
When was it that I met him?
Was it yesterday that I met him?
一般疑问句的形式
Is it 要强调的部分 that + 其他追问
还有第一句呢啊啊啊
追答应该是下楼的回答 by的用法
1）表示以一般的方法或方式。如：
No one in those days could live by writing poems.
（2）表示传达、传递的方式或煤介。如：
How did you send the letter, by airmail or by ordinary mail?
（3）表示用交通工具、通讯工具后接名词单数，不加冠词。如：
He came by train, but his wife came by bus.
注意下面两句的区别：
Did you come by train?
Did you come in his car / on my bike?
“by +抽象名词”构成的词组有：by accident / by chance / by diligence / by effort / by force / by heart / by luck / by mistake / by hard work.
将来完成时用来表示在将来某一时间以前已经完成或一直持续的动作。经常与before+将来时间或by+将来时间连用，也可与before或by the time引导的现在时的从句连用。
1) 构成will / be going to do sth.
2) 概念
a. 状态完成：表示某事继续到将来某一时为止一直有的状态。
b. 动作完成：表示将来某一时或另一个将来的动作之前，已经完成的动作或一获得的经验。
强调句结构，It is + 强调部分 +that /who +其余部分。
强调句的关键在于去掉it is ......that 仍然是个完整的句子。
第一句句型分析哈~
追答who of you by worrying can add a single hour to his life这句话by worrying 做定语
