English verb conjugation
CAN ROAST

Regular verb: roast - roasted - roasted

Affirmation

Simple form	V-ing form
I can roast you can roast he can roast we can roast you can roast they can roast	I can be roasting you can be roasting he can be roasting we can be roasting you can be roasting they can be roasting
Perfect	V-ing perfect
I can have roasted you can have roasted he can have roasted we can have roasted you can have roasted they can have roasted	I can have been roasting you can have been roasting he can have been roasting we can have been roasting you can have been roasting they can have been roasting

Negation

Simple form	V-ing form
I can't roast you can't roast he can't roast we can't roast you can't roast they can't roast	I can't be roasting you can't be roasting he can't be roasting we can't be roasting you can't be roasting they can't be roasting
Perfect	V-ing perfect
I can't have roasted you can't have roasted he can't have roasted we can't have roasted you can't have roasted they can't have roasted	I can't have been roasting you can't have been roasting he can't have been roasting we can't have been roasting you can't have been roasting they can't have been roasting

Interrogative form

Simple form	V-ing form
can I roast? can you roast? can he roast? can we roast? can you roast? can they roast?	can I be roasting? can you be roasting? can he be roasting? can we be roasting? can you be roasting? can they be roasting?
Perfect	V-ing perfect
can I have roasted? can you have roasted? can he have roasted? can we have roasted? can you have roasted? can they have roasted?	can I have been roasting? can you have been roasting? can he have been roasting? can we have been roasting? can you have been roasting? can they have been roasting?

Interro-negative form

Simple form	V-ing form
can't I roast? can't you roast? can't he roast? can't we roast? can't you roast? can't they roast?	can't I be roasting? can't you be roasting? can't he be roasting? can't we be roasting? can't you be roasting? can't they be roasting?
Perfect	V-ing perfect
can't I have roasted? can't you have roasted? can't he have roasted? can't we have roasted? can't you have roasted? can't they have roasted?	can't I have been roasting? can't you have been roasting? can't he have been roasting? can't we have been roasting? can't you have been roasting? can't they have been roasting?