`50.` He used to play piano at night.
`51.` If our grandparents didn't live so far away, we could see them very often.
`52.` I wish our teacher were here at the moment.
`53.` Your father watched a football match on TV last night, didn't he?
`54.` It's very wonderful to spend the weekend in the countryside.
`55.` The garden isn't big enough to play football in.
`56.` Although Tim took a taxi, he still arrived late for the meeting.
`57.` Because my sister was busy, she couldn't go to the party.
`58.` Your sister read books yesterday afternoon, didn't she?
`59.` If I knew her address, I would visit her.
`60.` It takes Loan 2 hours to learn English on the website 123.com.
@ `Ly`