English verb conjugation COULD RAIN
Regular verb: rain - rained - rained
Affirmation
Simple form
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it could rain
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V-ing form
--
it could be raining
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Perfect
--
it could have rained
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V-ing perfect
--
it could have been raining
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Negation
Simple form
--
it could not rain
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V-ing form
--
it could not be raining
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Perfect
--
it could not have rained
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V-ing perfect
--
it could not have been raining
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Interrogative form
Simple form
--
could it rain?
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V-ing form
--
could it be raining?
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Perfect
--
could it have rained?
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V-ing perfect
--
could it have been raining?
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Interro-negative form
Simple form
--
could it not rain?
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V-ing form
--
could it not be raining?
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Perfect
--
could it not have rained?
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V-ing perfect
--
could it not have been raining?
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