1, I haven't visited the museum once before.
⇒ This is the first time I have visited the museum.
2, We spent five hours getting to London
⇒ It took us five hours to get to London.
3, Someone is going to tune my piano tomorrow.
⇒ I am going to have my piano tuned tomorrow.
Xin ctlhn!
Chúc bn hk tốt!