'some' is a quantifier. It measures quantity, so it takes a singular verb if its object is non-count, and it takes a plural verb if its object is count and plural, like this,
Some milk is on the floor. ('milk' is a non-count noun, singular)
Some books are on the floor. ('books' is a count noun, and its plural)
'there' is an empty subject. If its reference is singular then the verb will be signular. If its referent is plural then the verb will be plural, like this,
There is a book on the table.
There are books on the table.
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