Conjugation

Definition and stakes

R. G. Latham,  The English Language

“ And it is this superadded idea of action that superadds to the verb the phenomena of tense, mood, person, and voice; in other words, the phenomena of conjugation.
§ 343. A noun is a word capable of declension only. A {290}verb is a word capable of declension and conjugation also. The fact of verbs being declined as well as conjugated must be remembered. The participle has the declension of a noun adjective, the infinite mood the declension of a noun substantive. Gerunds and supines, in languages where they occur, are only names for certain cases of the verb.
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Source: Gutenberg

G. H. Armstrong,  English Grammar and Composition for Public Schools

“ A verb that forms its past tense by changing the vowel of the present, and its perfect participle by adding n or en to the present, is a verb of the strong or old conjugation; as, fall, fell, fallen.
Note.—Verbs of the old conjugation are called strong because they form their past tense within themselves. Verbs of the new conjugation are called weak because they form their past tense by the aid of an additional syllable.
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Source: Gutenberg

Brainerd Kellogg,  Higher Lessons in English: A work on English grammar and composition

“ FORMS OF THE VERB-CONTINUED. CONJUGATION OF THE VERB +BE+. [Footnote: The conjugation of be contains three distinct roots—as, be, was. Am, art, is, are are from as. Am = as-m (m is the m in me) . Art = as-t (t is the th in thou) .
Be was formerly conjugated, I be, Thou beest, He beth or bes; We be, Ye be, They be.]
+Direction+.—Learn the following forms, paying no attention to the line at the right of each verb:—
INDICATIVE MODE. PRESENT TENSE. Singular. Plural.
1. (I) am ——, 1. (We) are ——, 2. (You) are —— or 2. (You) are ——, (Thou) art ——, 3. (He) is ——; 3. (They) are ——.
PAST TENSE. 1.
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Source: Gutenberg

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