(青少年) are supposed to help with housework to develop their independence.
聚会结束时我唱了一首歌.
I at the end of the party.
窗户旁边有一架钢琴.
There is a piano .
我想邀请他参加我们的俱乐部.
I want to join our club.
Though I can't watch my favorite program tonight,it's not a big deal.
You are supposed to ask your teacher for help.