Conjugación del verbo inglés
CAN ROOF

Verbo regular: roof - roofed - roofed

Afirmación

Forma simple	Forma con V-ing
I can roof you can roof he can roof we can roof you can roof they can roof	I can be roofing you can be roofing he can be roofing we can be roofing you can be roofing they can be roofing
Perfecto	Perfecto con V-ing
I can have roofed you can have roofed he can have roofed we can have roofed you can have roofed they can have roofed	I can have been roofing you can have been roofing he can have been roofing we can have been roofing you can have been roofing they can have been roofing

Negación

Forma simple	Forma con V-ing
I cannot roof you cannot roof he cannot roof we cannot roof you cannot roof they cannot roof	I cannot be roofing you cannot be roofing he cannot be roofing we cannot be roofing you cannot be roofing they cannot be roofing
Perfecto	Perfecto con V-ing
I cannot have roofed you cannot have roofed he cannot have roofed we cannot have roofed you cannot have roofed they cannot have roofed	I cannot have been roofing you cannot have been roofing he cannot have been roofing we cannot have been roofing you cannot have been roofing they cannot have been roofing

Forma interrogativa

Forma simple	Forma con V-ing
can I roof? can you roof? can he roof? can we roof? can you roof? can they roof?	can I be roofing? can you be roofing? can he be roofing? can we be roofing? can you be roofing? can they be roofing?
Perfecto	Perfecto con V-ing
can I have roofed? can you have roofed? can he have roofed? can we have roofed? can you have roofed? can they have roofed?	can I have been roofing? can you have been roofing? can he have been roofing? can we have been roofing? can you have been roofing? can they have been roofing?

Forma interro-negativa

Forma simple	Forma con V-ing
can I not roof? can you not roof? can he not roof? can we not roof? can you not roof? can they not roof?	can I not be roofing? can you not be roofing? can he not be roofing? can we not be roofing? can you not be roofing? can they not be roofing?
Perfecto	Perfecto con V-ing
can I not have roofed? can you not have roofed? can he not have roofed? can we not have roofed? can you not have roofed? can they not have roofed?	can I not have been roofing? can you not have been roofing? can he not have been roofing? can we not have been roofing? can you not have been roofing? can they not have been roofing?