Simple Present Tense in English – Grammar Rules and Notes
https://www.youtube.com/watch?v=MA6K7BSSzcQ
Present Continuous Tense | English Grammar
https://www.youtube.com/watch?v=BiLCwBKlzJI
Present Perfect Tense | English Grammar
https://www.youtube.com/watch?v=PxZ9aPqGxRw
Present Perfect Continuous Tense | English Grammar
https://www.youtube.com/watch?v=Mfeh6paXkco
Simple Past Tense–Grammar Rules | English Grammar
https://www.youtube.com/watch?v=o1hAJrr7sbU