1.millie usually goes to school by bike 【同义句】
millie usually rides a bike to school
2.there are some candles on the cake【改为否定句】
there aren't any candles on the cake
3.Are there any balls under the bed?【改为陈述句】
there are some balls under the bed
4.I would like some drink【改为一般疑问句】
would you like some drink?