This subject came up recently when one of the students in an online copy-editing class I teach wrote, “I have not found a comprehensive source for conjugated verbs. Some dictionaries have the various verb forms, but I can’t always form the full conjugations from that list.”
This student already has a lot of professional experience and is quite savvy in language and editing. So I figured that if she hasn’t been able to find a universal, comprehensive, all-knowing source of verb conjugations, it couldn’t hurt to revisit the topic here.
The answer, of course, is that the very dictionaries in which my student found only partial information are 100% comprehensive sources for knowing how to conjugate every English verb under the sun. But you have to know how to find that information first.
Turn, as my student did, to a verb like “ring,” and you’ll see next to it “rang, rung,” indicating the past tense and past participles, respectively. But turn to the verb “walk” and you won’t see “walked, walked” indicating its past tense and past participle. Hence her conclusion that the dictionary contains only partial help on verb forms.
But if you turn all the way to the front of the dictionary, to the introductory sections most of us flip right past, you’ll find everything you need to bridge the gap.
For example, Merriam-Webster’s Collegiate Dictionary’s “Explanatory Notes” section says that most inflected forms of words “are covered explicitly or by implication at the main entry for the base form. … When these inflected forms are created in a manner considered regular in English…the inflected form is not shown.”