The past tense form of the word "cost" is simply "cost". This is an example of an irregular verb in English, where the base form, past simple, and past participle are all the same. Unlike regular verbs, which follow a standard pattern of adding '-ed' or '-d' for their past forms, irregular verbs don't follow a specific pattern and must be learned individually. These quirky aspects of language might seem perplexing initially, but mastering them will give you an edge in your language skills, sort of like knowing the secret handshake in a club! Stay curious, keep learning, and you'll discover that the irregularities are what make language fun and dynamic.
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