81. I haven't gone to Ho Chi Minh City for 6 years

82. A visitor asked Lan where the post office was

83. Would you mind lending me your ruler?

84. It took us 5 hours to get to London

`81.` I haven't gone to Ho Chi Minh City for 6 years.

Giải thích: The last time S V-ed was [quãng thời gian] ago = S have/has not Vpp for [quãng thời gian]

`82.` A visitor asked Lan where the post office was.

Giải thích: Câu tường thuật lùi thì: HTĐ `->` QKĐ.

`83.` Would you mind if I borrowed your ruler?

Giải thích: Would you mind if S V-ed?

`84.` It took us five hours to get to London.

Giải thích: S spend [time] V-ing = It takes S [time] to V.

@ `Ly`