I can trip you can trip he can trip we can trip you can trip they can trip
V-ing form
I can be tripping you can be tripping he can be tripping we can be tripping you can be tripping they can be tripping
Perfect
I can have tripped you can have tripped he can have tripped we can have tripped you can have tripped they can have tripped
V-ing perfect
I can have been tripping you can have been tripping he can have been tripping we can have been tripping you can have been tripping they can have been tripping
Negation
Simple form
I can't trip you can't trip he can't trip we can't trip you can't trip they can't trip
V-ing form
I can't be tripping you can't be tripping he can't be tripping we can't be tripping you can't be tripping they can't be tripping
Perfect
I can't have tripped you can't have tripped he can't have tripped we can't have tripped you can't have tripped they can't have tripped
V-ing perfect
I can't have been tripping you can't have been tripping he can't have been tripping we can't have been tripping you can't have been tripping they can't have been tripping
Interrogative form
Simple form
can I trip? can you trip? can he trip? can we trip? can you trip? can they trip?
V-ing form
can I be tripping? can you be tripping? can he be tripping? can we be tripping? can you be tripping? can they be tripping?
Perfect
can I have tripped? can you have tripped? can he have tripped? can we have tripped? can you have tripped? can they have tripped?
V-ing perfect
can I have been tripping? can you have been tripping? can he have been tripping? can we have been tripping? can you have been tripping? can they have been tripping?
Interro-negative form
Simple form
can't I trip? can't you trip? can't he trip? can't we trip? can't you trip? can't they trip?
V-ing form
can't I be tripping? can't you be tripping? can't he be tripping? can't we be tripping? can't you be tripping? can't they be tripping?
Perfect
can't I have tripped? can't you have tripped? can't he have tripped? can't we have tripped? can't you have tripped? can't they have tripped?
V-ing perfect
can't I have been tripping? can't you have been tripping? can't he have been tripping? can't we have been tripping? can't you have been tripping? can't they have been tripping?