What is the difference between "expected","we have expected"

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/26 11:44:30

What is the difference between "expected","we have expected" and "expectation" in this sentence.
Please explain in Mandarin and provide a better answer.
1)Our roofing sales is two times higher than expected.
2)Our roofing sales is two times higher than we have expected .
3)Our roofing sales is two times higher than expectation.
3)Our roofing salaes i

这几种表达都是表示：比预期的要...只是用的时态和词性不同而已

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