The rule that can make a sentence correct in Spanish is:
Spanish has many rules which are unlikely to be summarized in a paragraph, however, as a very general rule it can be mentioned that a sentence requires a noun, a conjugated verb and a complement:
Examples:
On the other hand, it should not be forgotten that if you want to use adjectives, they must correspond to the same gender and number of the noun:
Having this as a general rule will allow you to write adequate sentences in Spanish, regardless of the verb tense used.
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