should tread
Verbo irregular: tread - trod- trod, trodden

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd tread
you'd tread
she'd tread
we'd tread
you'd tread
they'd tread 	I'd be treading
you'd be treading
she'd be treading
we'd be treading
you'd be treading
they'd be treading	I should've trod, trodden
you should've trod, trodden
she should've trod, trodden
we should've trod, trodden
you should've trod, trodden
they should've trod, trodden	I should've been treading
you should've been treading
she should've been treading
we should've been treading
you should've been treading
they should've been treading	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't tread
you shouldn't tread
she shouldn't tread
we shouldn't tread
you shouldn't tread
they shouldn't tread 	I shouldn't be treading
you shouldn't be treading
she shouldn't be treading
we shouldn't be treading
you shouldn't be treading
they shouldn't be treading	I shouldn't have trod, trodden
you shouldn't have trod, trodden
she shouldn't have trod, trodden
we shouldn't have trod, trodden
you shouldn't have trod, trodden
they shouldn't have trod, trodden	I shouldn't have been treading
you shouldn't have been treading
she shouldn't have been treading
we shouldn't have been treading
you shouldn't have been treading
they shouldn't have been treading	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I tread?
should you tread?
should she tread?
should we tread?
should you tread?
should they tread? 	should I be treading?
should you be treading?
should she be treading?
should we be treading?
should you be treading?
should they be treading? 	should I have trod, trodden?
should you have trod, trodden?
should she have trod, trodden?
should we have trod, trodden?
should you have trod, trodden?
should they have trod, trodden? 	should I have been treading?
should you have been treading?
should she have been treading?
should we have been treading?
should you have been treading?
should they have been treading? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I tread?
shouldn't you tread?
shouldn't she tread?
shouldn't we tread?
shouldn't you tread?
shouldn't they tread? 	shouldn't I be treading?
shouldn't you be treading?
shouldn't she be treading?
shouldn't we be treading?
shouldn't you be treading?
shouldn't they be treading? 	shouldn't I have trod, trodden?
shouldn't you have trod, trodden?
shouldn't she have trod, trodden?
shouldn't we have trod, trodden?
shouldn't you have trod, trodden?
shouldn't they have trod, trodden? 	shouldn't I have been treading?
shouldn't you have been treading?
shouldn't she have been treading?
shouldn't we have been treading?
shouldn't you have been treading?
shouldn't they have been treading?