The Conjugator
English verb conjugation
COULD THUNDER

Regular verb: thunder - thundered - thundered

Affirmation

Simple form

V-ing form

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it could thunder
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-
-		-
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it could be thundering
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-
-

Perfect

V-ing perfect

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-
it could have thundered
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-
-		-
-
it could have been thundering
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-
-

Negation

Simple form

V-ing form

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it couldn't thunder
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-		-
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it couldn't be thundering
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-
-

Perfect

V-ing perfect

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it couldn't have thundered
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-
-		-
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it couldn't have been thundering
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-
-

Interrogative form

Simple form

V-ing form

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could it thunder?
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-
-		-
-
could it be thundering?
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-
-

Perfect

V-ing perfect

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-
could it have thundered?
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-
-		-
-
could it have been thundering?
-
-
-

Interro-negative form

Simple form

V-ing form

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-
couldn't it thunder?
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-
-		-
-
couldn't it be thundering?
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-
-

Perfect

V-ing perfect

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couldn't it have thundered?
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-
-		-
-
couldn't it have been thundering?
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-
-