The Present perfect is used to talk about.....: actions that started in past and continue until now., With I/YOU/WE/THEY....: we use HAVE+ VERB IN PAST PARTICIPLE+COMPLEMENT., I/YOU/WE/THEY HAVE TRAVELLED TO MIAMI SINCE 1998., With HE/SHE/IT ...: we use HAS+ VERB IN PAST PARTICIPLE+COMPLEMENT., HE/SHE HAS TRAVELLED TO MIAMI SINCE 1998., PRESENT PERFECT NEGATIVE FORM(WITH I/YOU/WE/THEY).: I/YOU/WE/THEY HAVEN'T TRAVELLED TO MIAMI., PRESENT PERFECT NEGATIVE FORM(HE/SHE/IT): HE/SHE/ IT HASN'T LIVED IN A BEAUTIFUL HOUSE.,

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