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

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could tread
you could tread
she could tread
we could tread
you could tread
they could tread 	I could be treading
you could be treading
she could be treading
we could be treading
you could be treading
they could be treading	I could have trod, trodden
you could have trod, trodden
she could have trod, trodden
we could have trod, trodden
you could have trod, trodden
they could have trod, trodden	I could have been treading
you could have been treading
she could have been treading
we could have been treading
you could have been treading
they could have been treading	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not tread
you could not tread
she could not tread
we could not tread
you could not tread
they could not tread 	I could not be treading
you could not be treading
she could not be treading
we could not be treading
you could not be treading
they could not be treading	I could not have trod, trodden
you could not have trod, trodden
she could not have trod, trodden
we could not have trod, trodden
you could not have trod, trodden
they could not have trod, trodden	I could not have been treading
you could not have been treading
she could not have been treading
we could not have been treading
you could not have been treading
they could not have been treading	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I tread?
could you tread?
could she tread?
could we tread?
could you tread?
could they tread? 	could I be treading?
could you be treading?
could she be treading?
could we be treading?
could you be treading?
could they be treading? 	could I have trod, trodden?
could you have trod, trodden?
could she have trod, trodden?
could we have trod, trodden?
could you have trod, trodden?
could they have trod, trodden? 	could I have been treading?
could you have been treading?
could she have been treading?
could we have been treading?
could you have been treading?
could they have been treading? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not tread?
could you not tread?
could she not tread?
could we not tread?
could you not tread?
could they not tread? 	could I not be treading?
could you not be treading?
could she not be treading?
could we not be treading?
could you not be treading?
could they not be treading? 	could I not have trod, trodden?
could you not have trod, trodden?
could she not have trod, trodden?
could we not have trod, trodden?
could you not have trod, trodden?
could they not have trod, trodden? 	could I not have been treading?
could you not have been treading?
could she not have been treading?
could we not have been treading?
could you not have been treading?
could they not have been treading?