3. present perfect Tense-Present PerfectConfirmed: S + have/has + Past participle (V3) + ONegative: S + have/has + NOT + Past participle + OQuestion: have/has + S + Past participle + OFrom getting to know: already, not ... yet, just, ever, never, since, for, recenthy, before. Usage:Present perfect tense describes the action happened or didn't happen in an unspecified time in the past. Present perfect tense is also described the establishment of action-1 again in the past. Present perfect tense is also used with i since and for. Since + the start time (1995, I was young, this morning etc.) When people say user since, the listener must calculate how long time. For + period (from the beginning until now) When the speaker used for the speaker, to calculate how long time.
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