If you're trying to spell the phrase "hast a bad time," it's important to keep in mind that "hast" is an archaic form of "have." So the correct modern spelling would be "have a bad time." In IPA phonetic transcription, "have" is pronounced as /hæv/ and "bad" as /bæd/. As "time" has a different sound in the first syllable, it is pronounced as /taɪm/. Therefore, the correct transcription would be /hæv ə bæd taɪm/.