`12.` They haven't swum in the Mediterranean since they were on holiday to Greece

`13.` The Prime Minister hasn't given a speech since 2001

`-` Chuyển từ HTHT `->` QKĐ dạng phủ định

`+)` S `+` last `+` Ved `+` when `+` S `+` V(qkđ)/in `+` mốc thời gian

`=` S `+` have/has `+` not `+` VpII `+` since `+` S `+` V(qkđ)/mốc thời gian

`FrozenQueen`

Các công thức đổi HTHT - QKĐ

S + has/have + not + V3/ed + for/since + time 

--> S + last + V2/ed 

--> The last time + S+ V2/ed + was + time 

--> It is / has been + time + since + S+ (last) + V2/ed 

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12. They have not swum in the Mediterranean since they were on holiday in Greece.

13. The Prime Minister hasn’t given a speech since 2001.

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