A1
There is / There are
There is / There are says that something exists or is located somewhere. This is not the same as be for a person’s job or quality (She is a doctor — only is, no there).
There is
Singular and uncountable:
There is a book on the table.There is a problem.There is milk in the fridge.
There are
Plural:
There are many people.There are flowers in the garden.
Negative: There isn't a café here. · There aren't any chairs.
Question: Is there a bank near here? · Are there any students in the class?
Pattern: There is + noun + place. A sentence like A book is on the table locates a book you already have in mind; it is not the usual way to introduce existence.