I can toast you can toast he can toast we can toast you can toast they can toast
V-ing form
I can be toasting you can be toasting he can be toasting we can be toasting you can be toasting they can be toasting
Perfect
I can have toasted you can have toasted he can have toasted we can have toasted you can have toasted they can have toasted
V-ing perfect
I can have been toasting you can have been toasting he can have been toasting we can have been toasting you can have been toasting they can have been toasting
Negation
Simple form
I can't toast you can't toast he can't toast we can't toast you can't toast they can't toast
V-ing form
I can't be toasting you can't be toasting he can't be toasting we can't be toasting you can't be toasting they can't be toasting
Perfect
I can't have toasted you can't have toasted he can't have toasted we can't have toasted you can't have toasted they can't have toasted
V-ing perfect
I can't have been toasting you can't have been toasting he can't have been toasting we can't have been toasting you can't have been toasting they can't have been toasting
Interrogative form
Simple form
can I toast? can you toast? can he toast? can we toast? can you toast? can they toast?
V-ing form
can I be toasting? can you be toasting? can he be toasting? can we be toasting? can you be toasting? can they be toasting?
Perfect
can I have toasted? can you have toasted? can he have toasted? can we have toasted? can you have toasted? can they have toasted?
V-ing perfect
can I have been toasting? can you have been toasting? can he have been toasting? can we have been toasting? can you have been toasting? can they have been toasting?
Interro-negative form
Simple form
can't I toast? can't you toast? can't he toast? can't we toast? can't you toast? can't they toast?
V-ing form
can't I be toasting? can't you be toasting? can't he be toasting? can't we be toasting? can't you be toasting? can't they be toasting?
Perfect
can't I have toasted? can't you have toasted? can't he have toasted? can't we have toasted? can't you have toasted? can't they have toasted?
V-ing perfect
can't I have been toasting? can't you have been toasting? can't he have been toasting? can't we have been toasting? can't you have been toasting? can't they have been toasting?