制冷综合性能系数计算:一道英语题目

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Today it is a great weather,isn't it?
上面的句子有误,请问该怎样修改?
(不用解释为什么)
各位注意,weather为不可数名词,前面不能加a吧
还有一个
Lucy and Lily didn't late for school the day before yesterday.
I don’t have pencils.Can you get a little for me?哪里有错?怎样改?

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1---It is a great weather today,isn't it?
2---Lucy and Lily were not late for school the day before yesterday.
3---I don’t have any pencils.Can you get one for me?
3 or I have no pencil(s).Can you get one for me?

.

It was great weather today,isn't it?

Lucy and Lily didn't wasn't for school the day before yesterday.Can you get a few for me?

Today it is great weather ,isn't it?
weather 不可数

Today it is a great weather,isn't it?
Lucy and Lily wasn't late for school the day before yesterday. I don't have pencils ,Can you get a few for me?
a little 修饰不可数名词 pencil 属可数名词

it is a great weather day,isn't it?

Today is a great weather,isn't it?