Write down what you think is a rule that could explain what makes a sentence grammatically correct or not in spanish. for example, you might write something like: "verbs always match nouns in number, and they usually come before the noun." in other words, make your best guess for the grammar rule that makes sense out of the pattern(s) you see in the phrases you have been working with. keep in mind that what you're after is a hunch, not a grammar rule from a textbook.

I think that a good grammar rule for Spanish would be "both affirmative sentences about the person you're talking to and questions said to a said person share the same structure, you only have to add the question marks at the beginning and at the end of the sentence".

Explanation:

For example, if I'm with my friend Juan and I want to ask him if he plays tennis, I'd say "¿Tú juegas al tenis?". If I already know that Juan plays tennis, I'd say "Tú juegas al tenis". The sentence is basically the same but the affirmation lacks question marks.

One Spanish rule that may help you know if a sentence is grammatically correct or not is that in Spanish all items have a gender, which is usually indicated by the last letter and will alter its prefix.

Unlike in English where we may say things like "a car" or "a chair" and see no gender applied to those objects, Spanish is different. Some examples can be:

and so on. In Spanish, all objects are assigned a gender that will have a corresponding prefix. When we use "A" in English, the Spanish equivalent will be "un" or "una", depending on the gender of the object. As we can see from the example, the gender is usually indicated by the last letter, if it ends with the letter A, it will have a "female" gender, otherwise, it is usually "male".

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cuando era un niño durante el verano salía a jugar con mis mejores amigos, ¿verdad?