Rewritten these sentences to their passive from 1. Did Sue knock that vase to the floor? 2. Did Ann discover the mistake?

Để chuyển các câu từ dạng chủ động sang dạng bị động, ta thực hiện các bước sau:
1. Xác định thể bị động của động từ trong câu
2. Chuyển chủ ngữ của câu chủ động thành bị động
3. Đưa động từ chính về dạng phù hợp với thể bị động

1. Was that vase knocked to the floor by Sue?

2. Was the mistake discovered by Ann?

Hoặc:

1. That vase was knocked to the floor by Sue, wasn't it?

2. The mistake was discovered by Ann, wasn't it?

Was that vase knocked to the floor? Yes, it was by Sue.

The mistake was discovered by Ann, wasn't it?

That vase was knocked to the floor by Sue, wasn't it?

Was the mistake discovered by Ann?