Daniel G. Brinton,
The Philosophic Grammar of American Languages…
“ All others are considered intransitive, even those which of themselves are active, but either have no expressed object (as, I love, I hate, etc.) , or the word which they govern is in the verb itself, as in the Greek οικοδομεο, οικουρεω. As these can govern a second accusative, the object incorporated in the verb is included in the idea they express.The tenses of the intransitive verbs, except the present and imperfect, while they drop ah and the possessive pronoun, are formed with that pronoun which forms sentences with a predicate. ”
