There are a fire drill yesterday.找出句子中的错误并改正We must walk quick down the stairs.They are talked about the weather because they are going to have a picnic.You mustn't eat and drink on the bus.

There are a fire drill yesterday.
找出句子中的错误并改正
We must walk quick down the stairs.
They are talked about the weather because they are going to have a picnic.
You mustn't eat and drink on the bus.

改为
There was a fire drill yesterday.
We must walk quickly down the stairs.
They are talking about the weather because they are going to have a picnic.
You can't eat and drink on the bus.

there was
walk quickly
are talking about
you can't

was
quickly
talking
couldn't