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Questions & Answers about El problema es grande.
Why is it el problema instead of la problema if the word ends in 'a'?
Would I ever change grande to grando to match the masculine word problema?
No, you can leave it as grande. Adjectives that end in -e in Spanish are gender-neutral. They stay exactly the same whether they describe a masculine noun like el problema or a feminine noun like la casa.
Why does this sentence use es instead of está for 'is'?
How would I make this sentence plural to say 'The problems are big'?