Are verbs tensed or tenseless?

Conclusion

We have seen that we cannot de-tense a sentence like (15) simply by changing its verb, since the tense of such a sentence is determined by a temporal adverb. More importantly, we have seen that de-tensing is a process of removing certain temporal restrictions from the truth-conditions of tensed sentences, and that tensed and tenseless forms of a verb do not differ in sense. Once we understand this, and once we realize that it is an historical accident that the tense of sentences in English if often indicated by means of the grammatical device of inflecting verbs, tensed verbs no longer seem to be the sort of item that needs to be purged from ordinary language in constructing its tenseless analogue. Indeed, although the distinction between tensed and tenseless verbs may still be of philosophic interest, this distinction hardly seems to deserve the pivotal role assigned to it in the literature.