三人行，必有我师(焉)

语法
认为, to think, vs 以为, to think in error
https://mandarinbean.com/yiwei-vs-renwei/
https://resources.allsetlearning.com/chinese/grammar/Expressing_%22mistakenly_think_that%22_with_%22yiwei%22

词汇
福, blessing/good fortune; 幸福, happiness (pinyin in tags)
https://mandarinbean.com/new-hsk-3-word-list/

Guardian:
我认为他和这件事的关系不大, I don't think he has much to do with this
沈巍啊，我以为我们是朋友, Shen Wei, I thought we were friends
大家都幸福我就幸福了, if everyone's happy then I'm happy

[For the record, there are twelve 认为 and seventy-three 以为 in the Guardian script; people obviously do a lot of thinking the wrong thing? although 以为 does turn up in the middle of chengyu etc. as well]

Me:
我以为考试是明天，难道你说是今天呢？
我祝你们很幸福的生活。