
All key grammatical elements are highlighted in bold + italic.
🔹 Rules: In Present Indefinite Tense, -s or -es is added to the base verb when the subject is He, She, It or any singular noun.
🔹 Rules: For is used to express the duration of an action. It answers “How long?” Used with Present Perfect, Past Perfect, Future Perfect, and Perfect Continuous tenses.
🔹 Rules: Since is used to indicate the starting point of an action. It answers “Since when?” Used with Present Perfect, Past Perfect, and Perfect Continuous tenses.
🔹 Rules: Before is used to indicate that one action happened earlier than another action. It connects two time clauses.
🔹 Rules: After is used to indicate that one action happened later than another action.
🔹 Rules: The -ing form (present participle/gerund) is used in:
✅ Summary: 120+ examples covering all uses of s/es, for, since, before, after, and verb+ing in English tenses. All key grammatical elements are highlighted in bold + italic