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

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could tread
you could tread
he could tread
we could tread
you could tread
they could tread 	I could be treading
you could be treading
he 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
he 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
he could have been treading
we could have been treading
you could have been treading
they could have been treading	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I couldn't tread
you couldn't tread
he couldn't tread
we couldn't tread
you couldn't tread
they couldn't tread 	I couldn't be treading
you couldn't be treading
he couldn't be treading
we couldn't be treading
you couldn't be treading
they couldn't be treading	I couldn't have trod, trodden
you couldn't have trod, trodden
he couldn't have trod, trodden
we couldn't have trod, trodden
you couldn't have trod, trodden
they couldn't have trod, trodden	I couldn't have been treading
you couldn't have been treading
he couldn't have been treading
we couldn't have been treading
you couldn't have been treading
they couldn't have been treading	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I tread?
could you tread?
could he tread?
could we tread?
could you tread?
could they tread? 	could I be treading?
could you be treading?
could he 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 he 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 he have been treading?
could we have been treading?
could you have been treading?
could they have been treading? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
couldn't I tread?
couldn't you tread?
couldn't he tread?
couldn't we tread?
couldn't you tread?
couldn't they tread? 	couldn't I be treading?
couldn't you be treading?
couldn't he be treading?
couldn't we be treading?
couldn't you be treading?
couldn't they be treading? 	couldn't I have trod, trodden?
couldn't you have trod, trodden?
couldn't he have trod, trodden?
couldn't we have trod, trodden?
couldn't you have trod, trodden?
couldn't they have trod, trodden? 	couldn't I have been treading?
couldn't you have been treading?
couldn't he have been treading?
couldn't we have been treading?
couldn't you have been treading?
couldn't they have been treading?