In the sentence "I have never seen it snow", what tense is the verb "snow"?
My coworker who is learning English asked me why "I have never seen it snowed" is incorrect, and I wasn't sure how to explain.
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"Snow" is a bare infinitive here. "Seen" carries the actual tense, and "snow" remains a bare infinitive no matter what the tense is. So:
At least some of these can be rephrased so that "snow" takes the tense instead of being a bare infinitive, usually with some differences in meaning or at least connotation.
snow here is not a verb, but an infinitive without to or the base form of the verb "to snow". In your example, snow has been used with a verb of perception: e.g. see, hear, feel. When used in this way, the following formula applies:
Verb + object + infinitive without to.
Let's look at another example: I have never heard her say that before. Here, verb = have heard, object = her, the infinitive without to = say.
In your example, the main verb is have seen with the tense of present perfect, the object is it, followed by snow as the infinitive without to.