@ashley2015,
Either one works, but i would prefer number one, as number two sounds rather awkward.
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Now, "I would like to ask if the grammar are correct in this two sentences?" One would say "the grammar
is correct," because grammar is a singular noun in this sentence. So you would ask: "I would like to ask if the grammar is correct . . . "
One would say ". . .
these two sentences" because sentences is plural. This object, for the singular, these objects for the plural.
So, your question should read: "I would like to ask if the grammar
is correct in
these two sentences."
Finally, you would end that sentence with a period, and not a question mark, because the introductory clause, "I would like to ask . . . " is a statement, not a question.