The spelling of the word "hadst go" uses archaic English grammar and syntax. It consists of the auxiliary verb "hadst," which is the second person singular form of "had" in the past tense. The addition of "-st" in "hadst" shows that it is a second person singular pronoun. "Go" is the verb in the infinitive form. This phrase translates to "you had to go" in modern English. The IPA phonetic transcription of "hadst go" is /hædst ɡəʊ/.