Final answer:
In English, it is not always necessary to include a subject pronoun because the verb form indicates the subject. The grammatical function of the pronoun in a sentence determines its case (subjective, objective, or possessive). Subject pronouns can be omitted when the verb form itself indicates the subject.
Step-by-step explanation:
In English, it is not always necessary to include a subject pronoun because the verb form indicates the subject. The grammatical function of the pronoun in a sentence determines its case, which can be subjective, objective, or possessive. Subject pronouns are used when the pronoun is the subject of the sentence, but in some cases, the verb form itself indicates the subject, making the subject pronoun unnecessary.For example, in the sentence 'She is running,' the verb form 'is' clearly indicates the subject 'she,' so there is no need to include the subject pronoun 'she' again. Similarly, in the sentence 'They are playing,' the verb form 'are' indicates the subject 'they.' In both cases, the subject pronouns can be omitted without affecting the clarity or grammatical correctness of the sentences.It is also important to consider the formality of the communication. In more informal contexts, subject pronouns are often omitted for brevity, while in formal writing or situations, including a subject pronoun may be preferred for clarity.