`1`. Vietnamese women have worn Ao Dai for a century.
`->` S + began + Ving/ to V + thời gian + ago
`=` S + have/has + Vpp + for + khoảng thời gian
`2`. I haven't been impressed by the natural view in my home village since last trip.
`->` The last time + S + V2/ed + was + ........
`=` S + have/has + not + Vpp + ........
`3`. She hasn't made her own style since 2020.
`->` The last time + S + V2/ed + was + in thời gian
`=` S + have/has + not + Vpp + since + thời gian