`5.` How long have you moved to this house ?
`→`When + did + S + V ?
`=` How long + have/has + S + VPII ?
`6.` It's months since I last ate out with friends.
`=` The last time I ate out with friends was months ago.
`→`Phủ định của hiện tại hoàn thành : S + have/has not + VPII + for/since thời gian
`=` The last time (Lần cuối cùng) + S last + V quá khứ + was + time + ago
`=` It’s + time + since + S + last + V2/ed + O
`7.` It's a year since he last went skiing.
`=` The last time he went skiing was a year ago.
`→`Phủ định của hiện tại hoàn thành : S + have/has not + VPII + for/since thời gian
`=` The last time (Lần cuối cùng) + S last + V quá khứ + was + time + ago
`=` It’s + time + since + S + last + V2/ed + O
