On weekends,we must go there to learn the piano.为什么learn前要加to

On weekends,we must go there to learn the piano.为什么learn前要加to We don't take c_____ on weekends. We usually exercise on weekends.变否定句We ______ usually ____ on weekends we often look ____(comfortable) on weekends than on weekdays 一般疑问句.We will take a trip on weekends._ _ _ a trip on weekends? on weekends on weekends. we often play basketball on weekends改为一般疑问句 We work for nine hours each day on weekends.不懂 We often play piano on weekends哪里错了? we often climb mountains and watch insects on the weekends We often do housework on weekends的问句 We usually go to the m______ on weekends we have many classes on the weekends这句话对吗 we must keep the ( )on the road we must keep the( ) on the road What do your ( )often do on weekends?We often have great fun( )on the beach Let's go and see Miss Wang on weekends,shall we?还是Let's go and see Miss Wang on weekends,shall not we?本句是反意疑问句吗?