if they knew how difficult it was to drill through the hard rock,they would lose heart.这里这里it后面为什么加was

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if they knew how difficult it was to drill through the hard rock,they would lose heart.这里这里it后面为什么加was
if they knew how difficult it was to drill through the hard rock,they would lose heart.这里
这里it后面为什么加was

if they knew how difficult it was to drill through the hard rock,they would lose heart.这里这里it后面为什么加was
除了从属连接词、疑问代词、疑问副词、缩合连接代词和缩合连接副词外,感叹词what、how也可以引导一个名词性从句,如：
She told him what a brave boy he was.
He confessed with regret how foolish he had been.
She didn't know what a crime he had committed.
It's incredible how fast he can run.
You can imagine what difficulties I had with my children.
I told her how late I was.
你给出的这句句子就是一个以感叹词how引导的宾语从句,如果没有was,这句宾语从句里就没有谓语了（how difficult是表语,it是形式主语,to drill through the hard rock为真正的主语）.这句话的意思是：“如果他们知道钻透这块坚硬的岩石是多么困难的话,他们就会丧失信心了.”这是一个非真实条件句,所以用了虚拟语气.希望我能帮助你解疑释惑.

本句子可以是：　　If they knew how difficult to drill through the hard rock, they would lost heart.
加了it was 是补齐了句子的成分．　　　　用was 主要是因为：if 引导的从句用的是knew(过去时态)．

how difficult it was 是个感叹句。

If They Only Knew 歌词 If they knew how difficult it was to drill through the hard rock,they would是虚拟语气吗 if they knew how difficult it was to drill through the hard rock,they would lose heart.这里这里it后面为什么加was if they knew how difficult it was to drill through the hard rock,they would lose heart.这里为什么要加it,其什么作用 if they knew how difficult it was to drill through the hard rock,they would lose heart请帮我分析下这段话的语法结构. If only you knew how much I think of you英语怎么回答带翻译 If only you knew how much I think of you 中文意思 If I knew how to abandon you ,that should have much good丶什么意思? 英语翻译if only i knew how to operate an elecronic computer as you do 求翻译… If only I knew how to cook it! 跪求If They Only Knew-The 3Rd Storee歌曲链接求类似If They Only Knew一样的歌这种节奏的好听的歌曲 We Keep quiet ’cause we’re dead if they knew 帮我翻译下 . if you knew what i knew歌词 If You Knew What I Knew 歌词 If You Knew What I Knew 歌词 years ago they knew many things about the moon.they knew how big it was and how far it was from the earth.中的it was 放在how big ,how far If I Knew Then 歌词