HSK 3
以为
yǐwéi动
to think; to believe (often with the implication that the belief is mistaken – unless referring to one's own current belief)
我以为今天是星期五。
Wǒ yǐ wéi jīn tiān shì xīng qī wǔ.
I thought today was Friday.
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New in the HSK 3.0 word list at level 3.