should doubt
Regular verb: doubt - doubted- doubted

Affirmation 	
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I'd doubt
you'd doubt
she'd doubt
we'd doubt
you'd doubt
they'd doubt 	I'd be doubting
you'd be doubting
she'd be doubting
we'd be doubting
you'd be doubting
they'd be doubting	I should've doubted
you should've doubted
she should've doubted
we should've doubted
you should've doubted
they should've doubted	I should've been doubting
you should've been doubting
she should've been doubting
we should've been doubting
you should've been doubting
they should've been doubting	

Negation 	
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I shouldn't doubt
you shouldn't doubt
she shouldn't doubt
we shouldn't doubt
you shouldn't doubt
they shouldn't doubt 	I shouldn't be doubting
you shouldn't be doubting
she shouldn't be doubting
we shouldn't be doubting
you shouldn't be doubting
they shouldn't be doubting	I shouldn't have doubted
you shouldn't have doubted
she shouldn't have doubted
we shouldn't have doubted
you shouldn't have doubted
they shouldn't have doubted	I shouldn't have been doubting
you shouldn't have been doubting
she shouldn't have been doubting
we shouldn't have been doubting
you shouldn't have been doubting
they shouldn't have been doubting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I doubt?
should you doubt?
should she doubt?
should we doubt?
should you doubt?
should they doubt? 	should I be doubting?
should you be doubting?
should she be doubting?
should we be doubting?
should you be doubting?
should they be doubting? 	should I have doubted?
should you have doubted?
should she have doubted?
should we have doubted?
should you have doubted?
should they have doubted? 	should I have been doubting?
should you have been doubting?
should she have been doubting?
should we have been doubting?
should you have been doubting?
should they have been doubting? 	

Interro-negative form 	
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shouldn't I doubt?
shouldn't you doubt?
shouldn't she doubt?
shouldn't we doubt?
shouldn't you doubt?
shouldn't they doubt? 	shouldn't I be doubting?
shouldn't you be doubting?
shouldn't she be doubting?
shouldn't we be doubting?
shouldn't you be doubting?
shouldn't they be doubting? 	shouldn't I have doubted?
shouldn't you have doubted?
shouldn't she have doubted?
shouldn't we have doubted?
shouldn't you have doubted?
shouldn't they have doubted? 	shouldn't I have been doubting?
shouldn't you have been doubting?
shouldn't she have been doubting?
shouldn't we have been doubting?
shouldn't you have been doubting?
shouldn't they have been doubting?