Page:Latin for beginners (1911).djvu/101

Rh LESSON XXXI PERFECT, PLUPERFECT, AND FUTURE PERFECT OF SUM 183. Principal Parts. There are certain parts of the verb that are of so much consequence in tense formation that we call them the principal parts.

In English the principal parts are the present, the past, and the past participle; as, go, went, gone; see, saw, seen, etc.

The principal parts of the Latin verb are the first person singular of the present indicative, the present infinitive, the first person singular of the perfect indicative, and the perfect passive participle.

184. Conjugation Stems. From the principal parts we get three conjugation stems, from which are formed the entire conjugation. We have already learned about the present stem, which is found from the present infinitive (cf. § 126. a). The other two stems are the perfect stem and the participial stem.

185. The Perfect Stem. The perfect stem of the verb is formed in various ways, but may always be found by dropping -ī from the first person singular of the perfect, the third of the principal parts. From the perfect stem are formed the following tenses:



All these tenses express completed action in present, past, or future time respectively.

186. The Endings of the Perfect. The perfect active indicative is inflected by adding the endings of the perfect to the perfect stem. These endings are different from those found in any other tense, and are as follows: