Answer:
The rule that I think could be used to write sentences in Spanish is:
- A sentence written correctly in Spanish requires that the person notices that he has the basic form: <u>noun, verb and complement</u>, that in the section of the sentence where the person who executes the action is found: <u>the article and the adjective, are found in singular or plural, masculine or feminine, it is in concordance with the noun, the verb belongs to the appropriate tense and the complement, if it is of time, is related to the conjugate verb.</u>
Explanation:
Spanish has many grammar rules applicable to each of the tenses and its variations such as the Subjunctive and the Indicative, so making a single rule that includes all is unlikely, so in the response rule, I have added essential and important guidelines that can help a person whose mother tongue is not Spanish to understand it fairly.