I can say you can say he can say we can say you can say they can say
V-ing form
I can be saying you can be saying he can be saying we can be saying you can be saying they can be saying
Perfect
I can have said you can have said he can have said we can have said you can have said they can have said
V-ing perfect
I can have been saying you can have been saying he can have been saying we can have been saying you can have been saying they can have been saying
Negation
Simple form
I cannot say you cannot say he cannot say we cannot say you cannot say they cannot say
V-ing form
I cannot be saying you cannot be saying he cannot be saying we cannot be saying you cannot be saying they cannot be saying
Perfect
I cannot have said you cannot have said he cannot have said we cannot have said you cannot have said they cannot have said
V-ing perfect
I cannot have been saying you cannot have been saying he cannot have been saying we cannot have been saying you cannot have been saying they cannot have been saying
Interrogative form
Simple form
can I say? can you say? can he say? can we say? can you say? can they say?
V-ing form
can I be saying? can you be saying? can he be saying? can we be saying? can you be saying? can they be saying?
Perfect
can I have said? can you have said? can he have said? can we have said? can you have said? can they have said?
V-ing perfect
can I have been saying? can you have been saying? can he have been saying? can we have been saying? can you have been saying? can they have been saying?
Interro-negative form
Simple form
can I not say? can you not say? can he not say? can we not say? can you not say? can they not say?
V-ing form
can I not be saying? can you not be saying? can he not be saying? can we not be saying? can you not be saying? can they not be saying?
Perfect
can I not have said? can you not have said? can he not have said? can we not have said? can you not have said? can they not have said?
V-ing perfect
can I not have been saying? can you not have been saying? can he not have been saying? can we not have been saying? can you not have been saying? can they not have been saying?