The question about "the role of infinitive in this sentence" prompted me to ask the following question.
English uses a "dummy" such as it and there to start a sentence when there is nothing else to start an extra-posed sentence in the linked question or a sentence starting with "there". Please read the comments below the answer.
I object to calling "there" a subject of the sentence in the following:
There is a man at the door.
There is redundant as it could be rephrased to "A man is at the door/A man is there (pointing at the door)" as "at the door" indicates the place where a man physically exist at this moment. Here, "there" is a dummy which means nothing.
Another example:
There was no snow yesterday.
In this sentence, there means nothing and just indicates the existence of "snow" yesterday.
Oxford Online Dictionary classifies this dummy "there" as an "adverb"
3 (usually there is/are) Used to indicate the fact or existence of something: ‘there’s a restaurant round the corner’
Let's say two people are engaged in a phone conversation:
A: There was much snow yesterday in our town. Was there much snow?
B: Here was not much (snow).
If "there" in the abvoe is a subject as a dummy, why is "here" not a subject?
Note: I read the linked previous question with an interest but it doesn't address why "here" cannot be a dummy subject like dummy there.