......ALL TENSES.....1) Present SimpleUSage :->Facts(ALways true,general facts) I live in England.I like ice creanHabits:I usally shop on saturday.He drives fast.formulation:-2) present continuousformulation: sub+ to be(is,am,are)+v4 + O()Usage:Action in progress now:I am talking to youIts raining=====Mistake---------I am living in Nepal (for temporary) but I live in Nepal(for permanent=====Present Perfect continuous=====formulation: Sub+ has/have+been+ v4 +O( )I have been playing tennis.she has been playing tennis.Usage : Action that started in the past and still in progress How long i have been talking to you? I have been talking to you sunce 11.30 ======Present Perfect========= formulation: sub+ has/have + v3 + O ( ) I have played tennis Usage: Action that is complete at the time of speaking:I ahve studied 3 sections untill now.