I can roast you can roast he can roast we can roast you can roast they can roast
V-ing form
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
I can have roasted you can have roasted he can have roasted we can have roasted you can have roasted they can have roasted
V-ing perfect
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
I can't roast you can't roast he can't roast we can't roast you can't roast they can't roast
V-ing form
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
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
V-ing perfect
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
can I roast? can you roast? can he roast? can we roast? can you roast? can they roast?
V-ing form
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
can I have roasted? can you have roasted? can he have roasted? can we have roasted? can you have roasted? can they have roasted?
V-ing perfect
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
can't I roast? can't you roast? can't he roast? can't we roast? can't you roast? can't they roast?
V-ing form
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
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?
V-ing perfect
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?