please explain the English grammar of adding an "s" after verbs where it's present tense and singular third party

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In English grammar, when using the simple present tense, you add an 's' to the base form of the verb if the subject is third-person singular. This includes pronouns like he, she, and it, as well as singular nouns like John or the cat. For example, 'I walk' becomes 'He walks', and 'You eat' becomes 'She eats'. This is a fundamental rule in English verb conjugation. There are specific spelling rules when adding the third person singular 's'. For most verbs, simply add 's'. For verbs ending in s, sh, ch, x, z, or o, add 'es'. For verbs ending in a consonant plus y, change the y to 'ies'. But for verbs ending in a vowel plus y, just add 's'. These rules ensure proper pronunciation and spelling consistency. A common mistake is forgetting to add the 's' to verbs when the subject is third person singular. For example, saying 'He walk' instead of 'He walks', or 'She eat' instead of 'She eats'. Remember, this rule only applies to simple present tense with third person singular subjects. Always check your subject and add the appropriate verb ending. There are important exceptions to the third person singular 's' rule. When using auxiliary verbs like 'doesn't' or 'does', always use the base form of the main verb. Modal verbs like 'can' and 'will' also take the base form. Some verbs are irregular, like 'be' becomes 'is' and 'have' becomes 'has'. Remember, in questions and negative sentences, use the base form of the verb. To summarize, the third person singular 's' rule is fundamental in English grammar. Add 's' to verbs when the subject is he, she, it, or any singular noun in simple present tense. Remember the spelling rules and exceptions with auxiliary and modal verbs. Practice by asking yourself if the subject is third person singular, and you'll master this essential grammar rule. Keep practicing to make it automatic!