Sentences based on construction

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1

what are the sentences based on construction? this are not the 4 basic types of sentences so what is this,

thanks
mandy

2

I do not understand the first question. What is the reference here?

We do not teach the 4 basic types of sentences at LingQ. I believe that this division is arbitrary, unhelpful and a distraction to learning a language. I am sure these kinds of distinctions are taught in school, even to native speakers. I believe these distinctions are meaningless to most people. Certainly they are to me.