按被动句/否定句/一般疑问句的顺序如下：
1.My mum must be looked after by me./My mum needn't be looked after by me./Must my mum be looked after by me?
2.A pet shop was opened by him in Shenzhen./A pet shop wasn't opened by him in Shenzhen./ Was a pet shop opened by him in Shenzhen?
3.The picture will be painted by me next week./The picture won't be painted by me next week./
Will the picture be painted by me next week?
4.A piece of grass is tied by him around the neck of each bird./A piece of grass isn't tied by him around the neck of each bird./ Is a piece of grass tied by him around the neck of each bird?
5.More trees should be planted by us./More trees shouldn't be planted by us./ Should more trees be pianted by us?
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