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1·They had to practice the piano or violin for several hours a day.

他们不得不每天练习几个小时的钢琴或小提琴。

2·Somewhere, right now, a little kid is fighting with his parents about how much he needs to practice the piano.

现在的某个地方，一个小孩正在为练习弹钢琴的时长与父母讨价还价。

3·Somewhere, right now, a little kid is fighting with his parents about how much he needs to practice the piano.

现在的某个地方，一个小孩正在为练习弹钢琴的时长与父母讨价还价。

4·For example, how do I practice the piano?

例如，我如何练习钢琴？

5·When I get home, I can't watch TV because I have to practice the piano.

我回家不能看电视，因为我要练习钢琴。

6·I have to practice the piano.

我在练习钢琴。

7·I practice the piano on Sundays.

我每个星期天都练习弹钢琴。

8·I always practice the piano.

我总是练习钢琴。

9·We can practice the piano a week.

我们可以一周练习一两次钢琴。

10·Does she have to practice the piano?

她必须练习弹钢琴吗？