Certain it is that all essential processes of plant growth and development occur in water.此句中的it is that是什么句型？that是什么意思？It is that in water all essential processes of plant growth and development occur。正是在有水的情况下一切植物的生长和成长都会产生
但是由于本句还有certain一词，那么就与[url]http://强调句[/url]式无关了，它是It is certain that ...,certain式表语提前，表示强调该词，即：that后面的句子是[url]http://主语从句[/url]，it是[url]http://形式主语[/url]，也就是：that从句所表述的意思是肯定无疑的，
译成汉语就是：毫无疑问一切植物的生长和成长都产生在有水的情况下。

1. 连接词that一般不能省略，但当主句中含动词do的某种形式时，that可以省略。如：
What I want to do is (that) I can go up to him and thank him. 我想做的事是走到身边去感谢他。
2. 当句子的主语是：advice, demand, decision, desire, idea, insistence, instruction, order, plan, proposal, recommendation, request, requirement, suggestion, wish等名词时，表语从句须用虚拟语气，即：should +do。如：
My advice is that you should go to apologize to him. 我的建议是你应该去向他道歉。

that分句在非正式[url]http://语体[/url]中作表语时，其连词that通常可省略：
Our belief is (that) things will improve.
但若句子结构比较复杂，则that不可省略：
The energy debate is really just beginning. The only thing that is certain is 【that】 anybody who makes firm predictions about future will be in some part wrong.

由that引导主语从句不能省略。请看例句： That he has told lies is quite clear. 他说了谎，这一点很明显
主语从句:That the earth is round is known to all

i am afraid (that) ..................追问：形容词也有宾语阿？回答：
有的语法书 是这样说的 宾语分三类 动词宾语 [url]http://介词[/url]宾语 形容词宾语
但有的语法家 认为 形容词后面的 [url]http://不定式[/url] 或[url]http://从句[/url] 是状语
如 i am glad to see you 不定式是原因状语
i am glad that you have passed the exam 是[url]http://原因状语从句[/url]
但 [url]http://我们的教科书[/url] 规定 第二个句子 glad 后面是[url]http://宾语从句[/url] 作形容词glad的宾语
在主系表 结构中 形容词作[url]http://表语[/url] 后面的that从句是宾语从句 记住就行了

she intends to apply for that academic position
he is so devoted to his research that the idea he will soon have to retire never occur to him
students must observe carefully how good writers use words
how do you think we should handle the drug problem
the control of sand storms will involve a tremendous amount of works and money

That 's not to say only a sophisticated investor can set up a blind trust.当然，这并不意味着只有成熟老练的投资者才可以设立盲目信托

You know how banks offer those teaser zero percent interest rates?你知道那些银行是怎样让无息贷款变成笑话吗？

To be sure , china 's economy could soon turn around.可以肯定的是，中国的经济可能很快就会好转。

I 'll sometimes hear , " yea , I 'm in on that deal ."有时我会听到这样的话：“不错，我参与了那桩交易

adv.寻找[例句]Lawyers in search of new markets.律师们寻找新市场。

>（用于替代whoever,表示强调）[例句]She kept the extra bread on the window-sill , for whosoever would take it away.她把额外的面包放在窗台上，无论谁都可拿走

运用形容词首先要分清 这个形容词修饰什么内容。第一句中beautiful 修饰的是句子的表语girl，美丽的女孩，所以是 a [url]http://beautiful girl[/url].第二句中tired修饰的成分是I 而不是书tired,tired做I 的表语，这里的意思是 “我厌烦”，具体厌烦什么呢，这里是“我厌烦这本书”形容词后面不能直接接宾语，通过介词of帮忙 所以是of the book。一定要记住be tired of 是固定搭配 意为：厌烦某物。
2.of是介词后面接宾语，这里是特指的一本书，“我”只厌烦那一本书，而不是书这一类东西，所以要用[url]http://定冠词[/url]the限定一下

at hand
在手边
I haven't my book at hand. 我的书不在手边。
即将到来
He believes that the great day is at hand. 他相信这个伟大的日子就要到来。
in hand
在手头的
I have enough data in hand. 我手上有足够的资料。
被控制住
The situation is now in hand. 局势已经控制住了。
在进行中
The printing of the book is now in hand. 这本书正在[url]http://付印[/url]中。
on hand
在手头,在近处
There weren't enough snacks on hand for the party. 现有宴会的点心不够用。
We have nobody on hand to repair your car. 我们现在没有人能修你的车。
I always like to keep a certain amount of money on hand. 我总喜欢在手头备好一笔钱。
出席,在场
clasp sb. by the hand
紧握某人的手
He clasped his old friend by the hand. 他紧紧地握住老朋友的手。评论(6)