when can we omit the subject in a sentence?

[Bogdanno2]

My question is: when can we omit the subject in a sentence?
Some notes:

1)I asked this question on a forum
"Please come to visit the New International Hotel in the convenient city center location. The hotel is just minutes away from great shopping. A bank and a famous cafe are next to the hotel. Across the street is a popular bakery. You can also visit beaches by bus, about 15 minutes away. By subway, you can go to interesting shops and gourmet restaurants. You can even visit a discothéque or pub. Taxi service is available 24 hours.
Is the sentence "Across the street is a popular bakery" correct or should it be "Across the street there is a popular bakery"?What if we say "Next door is a bakery", is that correct?"

and I got the replies: "Both are correct. A popular bakery IS across the street. Statement of fact. It's the same format as the previous sentence about the bank and cafe.

There is a popular ... tells you that if you are looking for a bakery then there is one across the street.

Additional Q.. Yes. Well No actually. The bakery is across the street, not next door. Next door are a bank and a cafe." (za)
Either is correct. The more common way is to omit the 'there'.(William W)

2) I am aware some special sentences don't need a subject or predicate, for example exclamation or dialogue sentences. I am not asking about these- I ask about common "not so peculiar" sentences, as the ones I mentioned above.
Is "across the street" a subject, it doesn't look like that to me.

3)"Be careful not to omit "it" from an expletive(also called a subject filler)

NO: is a lovely day.

YES: It is a lovely day "(Handbook for writers, Simon and Schuster)

4) Note that saying "Is a lovely day" is acceptable in languages like Spanish or Romanian.

[Bogdanno2]

Oh I see that Avril asked a similar question as this.

[Bogdanno2]

n English, to emphasize the location, you can put the location (Across the street) in the front of the sentence and omit what you call the subject (there, in this case).

This does not apply to 'time phrases', meaning you can't say "On this Saturday is a football match."
You have to say "On this Saturday there is a football match."

I'll give you several examples.

Under the tree is a dog.
Next to the park stands a clock tower.
Underneath his jacket was his white tucked in t-shirt and jeans.
Deep beneath the sea lies the mysterious kingdom of Captain Nemo.

I'm sure after reading more sentences like these, you'll find it not so strange to your ear (sophiaengpro)