Now that you have worked through a lot of material that includes these basic patterns, and you have compared grammatically correct and incorrect sentences, write down what you think is a rule that could explain what makes a sentence grammatically correct or not. 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. Review if you need to, and you might briefly check your hunches against the sentences you have been working with in this or previous modules. Keep in mind that what you're after is your hunch, not a grammar rule from a text book. Now check your hunch with the explanation of this principle in the following pattern.

To know if a sentence is grammatically complete, a good hunch would be to focus on the sentence communicating something clear; It does not matter if it consists of a single word, a sentence or several. Since a sentence is composed of subject and predicate, it is important to identify the type of subject and if the way the predicate is affecting it is correct. As the action is expressed through the verb, another hunch would be to identify if the verb is indeed affecting the subject in the way the sentence requires it. Finally, the best hunch is that it sounds logical what is written, if not surely something is grammatically incorrect and it would be the first step to review the sentences you have worked.