The principal parts of a verb are the forms which determine its conjugation; for example, go, went, gone, are the principal parts of the verb go. They are the present tense, first person, singular; the past tense, first person, singular; and the past participle. When we know these three forms of any verb, we shall usually be able to conjugate the whole verb. These parts may be remembered as the three which take the places of the blanks in the following sentences: