For example, although it is true to say that the noun group is the structure we choose for the things we want to talk about, it is not the only one. Sometimes we want to talk about an event or an idea that is not easy to express in a noun group. Instead we can use a clause as the subject of another clause. e.g All I want is a holiday. (Quoted from the introduction of Collins COBUILD English Grammar )
The stuff, the subject, the matter we want to talk about If you don't understand this, go to one of your friends/teachers who speak your language to translate it to you. I mean, it's basic, you shouldn't have doubts about such things.
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