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 can't say you can't say he can't say we can't say you can't say they can't say
V-ing form
I can't be saying you can't be saying he can't be saying we can't be saying you can't be saying they can't be saying
Perfect
I can't have said you can't have said he can't have said we can't have said you can't have said they can't have said
V-ing perfect
I can't have been saying you can't have been saying he can't have been saying we can't have been saying you can't have been saying they can't 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't I say? can't you say? can't he say? can't we say? can't you say? can't they say?
V-ing form
can't I be saying? can't you be saying? can't he be saying? can't we be saying? can't you be saying? can't they be saying?
Perfect
can't I have said? can't you have said? can't he have said? can't we have said? can't you have said? can't they have said?
V-ing perfect
can't I have been saying? can't you have been saying? can't he have been saying? can't we have been saying? can't you have been saying? can't they have been saying?