I can toast you can toast she can toast we can toast you can toast they can toast
V-ing form
I can be toasting you can be toasting she can be toasting we can be toasting you can be toasting they can be toasting
Perfect
I can have toasted you can have toasted she 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 she can have been toasting we can have been toasting you can have been toasting they can have been toasting
Negation
Simple form
I cannot toast you cannot toast she cannot toast we cannot toast you cannot toast they cannot toast
V-ing form
I cannot be toasting you cannot be toasting she cannot be toasting we cannot be toasting you cannot be toasting they cannot be toasting
Perfect
I cannot have toasted you cannot have toasted she cannot have toasted we cannot have toasted you cannot have toasted they cannot have toasted
V-ing perfect
I cannot have been toasting you cannot have been toasting she cannot have been toasting we cannot have been toasting you cannot have been toasting they cannot have been toasting
Interrogative form
Simple form
can I toast? can you toast? can she toast? can we toast? can you toast? can they toast?
V-ing form
can I be toasting? can you be toasting? can she be toasting? can we be toasting? can you be toasting? can they be toasting?
Perfect
can I have toasted? can you have toasted? can she 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 she have been toasting? can we have been toasting? can you have been toasting? can they have been toasting?
Interro-negative form
Simple form
can I not toast? can you not toast? can she not toast? can we not toast? can you not toast? can they not toast?
V-ing form
can I not be toasting? can you not be toasting? can she not be toasting? can we not be toasting? can you not be toasting? can they not be toasting?
Perfect
can I not have toasted? can you not have toasted? can she not have toasted? can we not have toasted? can you not have toasted? can they not have toasted?
V-ing perfect
can I not have been toasting? can you not have been toasting? can she not have been toasting? can we not have been toasting? can you not have been toasting? can they not have been toasting?