A teacher's job is to.His job is to.Our plan is to.这些be动词后都加动词不定式而为什么My habbit is (dong),..My favourite activity is +doing

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Ateacher''sjobisto.Hisjobisto.Ourplanisto.这些be动词后都加动词不定式而为什么Myhabbitis(dong),..Myfavouriteactivityis+

A teacher's job is to.His job is to.Our plan is to.这些be动词后都加动词不定式而为什么My habbit is (dong),..My favourite activity is +doing
A teacher's job is to.His job is to.Our plan is to.这些be动词后都加动词不定式
而为什么My habbit is (dong),..My favourite activity is +doing

A teacher's job is to.His job is to.Our plan is to.这些be动词后都加动词不定式而为什么My habbit is (dong),..My favourite activity is +doing
没有这样的规定的.
A teacher's job is teaching
=A teacher's job is to teach.
也可以倒过来说：
Teachinig/To teach is a teacher's job.
My habbit is getting up early.
=My habbit is to get up early.
也都行的.
有人说
doing是抽象的动作
而
to do是具体的动作,也就是要发生的动作的.
Our plan is to start soon.
我的计划是马上出发.（就要发生的）
但如果用在这个结构中,其实都差不多的.
要注意的就是
想知道be doing是进行时,还是be+表语
只要把doing跟主语换个位置就行了.
如：
My work is teaching.
=Teaching is my work.
He is working
就不能换成
working is he了.

to do表示将要进行的动作
doing表示正在进行或经常性的动作

爱好和习惯很显然应是名词，所以用动名词形式，把动词词组变为名词词组，而工作是梦想是强调动作，就用不定式了

动名词和不定式作表语的区别：
不定式表一次具体的动作，而动名词表周期性重复的动作。

请参考：http://zhidao.baidu.com/question/510251114.html

你出示的句子中肯定是出自阅读文，因为没有后文。一般加to是为了表现后面的内容、地位以及程度。
后文中你问的应该是doing。do是个动词原形，但是它本身也是一个动词，而它前面有一个be动词，两个动词是不可能组成结构的，所以这里的doing是做得动名词。
还有【最喜欢的】这个单词应该是favorite，貌似你拼错了罢...

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你出示的句子中肯定是出自阅读文，因为没有后文。一般加to是为了表现后面的内容、地位以及程度。
后文中你问的应该是doing。do是个动词原形，但是它本身也是一个动词，而它前面有一个be动词，两个动词是不可能组成结构的，所以这里的doing是做得动名词。
还有【最喜欢的】这个单词应该是favorite，貌似你拼错了罢

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