Rules and laws of application of the letter 's'in sentences
1. Plurals: The letter 's' is commonly used to indicate plural forms of nouns, such as adding 's' to words like book (books) or cat (cats).
2. Possessives: The letter 's' can also be used to indicate possession, such as adding 's to a noun to show ownership, like adding an apostrophe-s to show that the book belongs to the student (the student's book).
3. Verb conjugation: The letter 's' is often used to indicate third person singular present tense in verbs, such as adding 's' to the base form of a verb to show that he/she/it is performing the action (e.g. he walks, she runs).
4. Contractions: The letter 's' can be used in contractions to combine two words together, such as in the contraction "it's" for "it is" or "he's" for "he is".
5. Plural possessives: When indicating possession with plural nouns, the letter 's' is added after the apostrophe, such as the students' books (indicating that the books belong to multiple students).
6. Plural verb forms: When using plural subjects in sentences, the verb does not take an 's' at the end, such as "they play" instead of "they plays".
7. Acronyms: The letter 's' can be used in acronyms to stand for words, such as using 'S' to represent 'South' in directions (e.g. N for North, S for South).
8. Accents and regional variations: In some accents or regional variations of English, the letter 's' may be pronounced differently or omitted in certain words or phrases. It is important to be aware of these variations when speaking or writing in different contexts.