What is the past tenses of bid?

The past tense is bade.

Actually, it depends on what meaning the Word carries in the context of the sentence or statement. If the Word is used to express a command, order or request, then 'bade' is the past tense. However, if it is used to mean an offer or an amount an individual is willing to pay for an item, say, an auction, then the past tense retains the form of the present tense of the Word. In other Words, it is 'bid' even when used in the past tense.