should rain
Regular verb: rain - rained- rained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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it should rain
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it should be raining
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it should have rained
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it should have been raining
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Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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it should not rain
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it should not be raining
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it should not have rained
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it should not have been raining
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Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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should it rain?
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should it be raining?
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should it have rained?
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should it have been raining?
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Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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should it not rain?
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should it not be raining?
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should it not have rained?
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should it not have been raining?
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