when we use metals it is important to know how they how they react with differet substans,for example,water and oxygen主谓宾补定状表分别是?求援助啊!急在线等~

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whenweusemetalsitisimportanttoknowhowtheyhowtheyreactwithdifferetsubstans,forexample,waterandoxygen主

when we use metals it is important to know how they how they react with differet substans,for example,water and oxygen主谓宾补定状表分别是?求援助啊!急~~在线等~~~
when we use metals it is important to know how they how they react with differet substans,for example,water and oxygen主谓宾补定状表分别是?求援助啊!急~~在线等~~~

when we use metals it is important to know how they how they react with differet substans,for example,water and oxygen主谓宾补定状表分别是?求援助啊!急~~在线等~~~
这个句子的大框是：
时间状语从句+形式主语+系动词+表语+作为真正逻辑主语的不定式结构
when we use metals时间状语从句
to know how they react with different substans这不定式结构做整个句子的逻辑主语
is是系动词
important是表语
还要再细分的话就要拆开每个小句来分析了.
先看那个时间状语从句,在这个从句中：
when是时间状语从句的引导词,we是这个从句的主语 use是非谓语动词 metals是宾语
最后那个不定式：know是非谓语动词 how they react是宾语 with different substans是状语,表伴随

it 是形式主语，how they react with differet substans是真正意义上的主语，is当然就是谓语了，important 是表语。when we use metals是时间状语为莫子有形式和真主啊~~~老是听老师在那里念什么形主真主的~~为什么会有啊!一个主语不可以么?同学，劝你认真听课~~因为这个老师经常讲的。用it做形式主语，最重要的是避免头重脚轻。你看看，How...

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it 是形式主语，how they react with differet substans是真正意义上的主语，is当然就是谓语了，important 是表语。when we use metals是时间状语

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when we use metals / it is important to know / how they /how they react with differet substans /,for example,water and oxygenit 划分句子
时间状语从句when we use metals ...
主句how they react with differet substans 主语they 谓语react 宾语substan
补语it is important to know

We can use 'when' when when we use metals it is important to know how they how they react with differet substans,for example,water and oxygen主谓宾补定状表分别是?求援助啊!急~~在线等~~~ when do we use capital letter So we must be careful when we use the Internet. when we use public document ,where do we see them how can we treat the gas problem of infant when we use lactogen.I mean theDetailed description of the problem and help respondents provide accurate answers to We use b__ to keep warm when it is cold. When we talk about abilities in the past,we should use c______ we have to ___(is) useful when we use fire题目是不是有错? We can use c____ to take some photos when we go on a trip.怎么填 we use the subject form when the noun we are replacing is the subject.翻译 When we use computer,we can l____ a lot and k____ many things. what part of a watch do we use when we greet someone we usecouldinstead of canwhen we talk about___根据释义写出所缺单词 when we put on them,they are full.but they are empty when we dont use them.what are they? ①Z------ means nothing（------表示填空）②please,can,it,spell,you（连词成句）③I（形容词性所有格）④We need an e---------------- when we write wrong words.⑤We use a k---------- to open the door.⑥May I use your pencil s-- I woke up when we got I Love It When We Do 歌词