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