[译]我们几乎每天都要做实验。
[误]We have to carry out experiments nearly everyday.

[正]We have to carry out experiments nearly every day.
[注]everyday 是形容词，意为“每日的”、“日常的”、“平凡的”（=of every day；daily），例如：Traffic accidents are everyday occurrences. 交通事故是平凡的事件。/These are my everyday shoes, not my best ones. 这些是我平常穿的鞋子，并不是最好的。every day 是形容词 + 名词的短语，常用作状语，如：A student should prepare and review lessons every day. 学生要天天准备功课。