English verb conjugation COULD THUNDER

Regular verb: thunder - thundered - thundered

Affirmation

Simple form

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it could thunder
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V-ing form

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it could be thundering
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Perfect

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it could have thundered
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V-ing perfect

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it could have been thundering
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Simple form

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it could not thunder
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V-ing form

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it could not be thundering
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Perfect

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it could not have thundered
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V-ing perfect

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it could not have been thundering
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Simple form

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could it thunder?
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V-ing form

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could it be thundering?
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Perfect

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could it have thundered?
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V-ing perfect

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could it have been thundering?
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Simple form

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could it not thunder?
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V-ing form

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could it not be thundering?
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Perfect

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could it not have thundered?
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V-ing perfect

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could it not have been thundering?
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