Certainly personal sentences are found everywhere in our speech, even though we do not always notice them. Their main function is to simplify the text without compromising the information contained in it. Examples of definitely personal sentences are those where the basis is represented by a predicate - a verb of the first or second person in the present or future tense.
As the name implies, specifically-personal sentences include those constructions where the predicate can determine the person who performs the action. For example, in the sentence “I'll go to bed in half an hour”, where the grammatical basis is represented by the personal form of the first person verb , you can confidently substitute the word “I” as the subject. Such a substitution is the most reliable way to identify a definitely personal offer.
Certainly personal offers also include motivational constructions in which substitution of the subject is often impossible, but the person to whom the action belongs is easily identified. "Take out the trash until the evening." "Tell me, please, how to get to Pushkin Street?" In the first case, the person performing the action is “you,” and in the second, “you.” Although these words can not be substituted as a subject.
Thus, we see that the person who owns the action in a specific personal sentence is either the speaker or his interlocutor. But there is one exception. The group “definitely personal sentences” cannot be attributed to those examples where the predicate is represented by the past tense of the verb, since this form does not make it possible to accurately determine by whom the action is performed. For example, in the sentence “Yesterday I left and did not return”, the pronouns “I”, “you”, “he” can act as a subject. Therefore, it cannot be included in certain personal sentences.
Also a common mistake is to classify vaguely personal offers as definite personal ones. The first are constructions in which the grammatical basis is represented by a third-person verb plural. For example, "I was told to count the pillars on the avenue." And it seems that here you can definitely substitute the pronoun “they” for the subject, but many forget that nouns can also act as it. Given this, it turns out that we cannot unambiguously determine who exactly performs the action in this proposal. It is important to keep this in mind.
Certainly personal offers include only those in which, as the person who performs the action, “I”, “you”, “we” or “you” clearly appear. If you learn this, further work with similar designs will not be so difficult.
So, identifying definitely personal offers is easy. It is enough to just remember that the verb in it indicates the absent subject, in the place of which a certain pronoun can be substituted. Even the name of the category itself - "definitely personal" - gives a hint here and helps to avoid mistakes and confusions in the classification and analysis of such examples.