This is the 5th most frequent Chinese word.
不
"Not" or "no."
The word '不' is used to negate the verb '喜欢' (like), forming a negative sentence.
我不喜欢喝咖啡。
I don't like drinking coffee.
The word '不' is used here before the adjective '热' (hot) to negate it, indicating the lack of heat.
昨天晚上天不热。
It was not hot last night.
In this sentence, '不' is placed before the verb '知道' (know) to express the absence of knowledge.