I can think you can think she can think we can think you can think they can think
V-ing form
I can be thinking you can be thinking she can be thinking we can be thinking you can be thinking they can be thinking
Perfect
I can have thought you can have thought she can have thought we can have thought you can have thought they can have thought
V-ing perfect
I can have been thinking you can have been thinking she can have been thinking we can have been thinking you can have been thinking they can have been thinking
Negation
Simple form
I can't think you can't think she can't think we can't think you can't think they can't think
V-ing form
I can't be thinking you can't be thinking she can't be thinking we can't be thinking you can't be thinking they can't be thinking
Perfect
I can't have thought you can't have thought she can't have thought we can't have thought you can't have thought they can't have thought
V-ing perfect
I can't have been thinking you can't have been thinking she can't have been thinking we can't have been thinking you can't have been thinking they can't have been thinking
Interrogative form
Simple form
can I think? can you think? can she think? can we think? can you think? can they think?
V-ing form
can I be thinking? can you be thinking? can she be thinking? can we be thinking? can you be thinking? can they be thinking?
Perfect
can I have thought? can you have thought? can she have thought? can we have thought? can you have thought? can they have thought?
V-ing perfect
can I have been thinking? can you have been thinking? can she have been thinking? can we have been thinking? can you have been thinking? can they have been thinking?
Interro-negative form
Simple form
can't I think? can't you think? can't she think? can't we think? can't you think? can't they think?
V-ing form
can't I be thinking? can't you be thinking? can't she be thinking? can't we be thinking? can't you be thinking? can't they be thinking?
Perfect
can't I have thought? can't you have thought? can't she have thought? can't we have thought? can't you have thought? can't they have thought?
V-ing perfect
can't I have been thinking? can't you have been thinking? can't she have been thinking? can't we have been thinking? can't you have been thinking? can't they have been thinking?