I can tickle you can tickle she can tickle we can tickle you can tickle they can tickle
V-ing form
I can be tickling you can be tickling she can be tickling we can be tickling you can be tickling they can be tickling
Perfect
I can have tickled you can have tickled she can have tickled we can have tickled you can have tickled they can have tickled
V-ing perfect
I can have been tickling you can have been tickling she can have been tickling we can have been tickling you can have been tickling they can have been tickling
Negation
Simple form
I can't tickle you can't tickle she can't tickle we can't tickle you can't tickle they can't tickle
V-ing form
I can't be tickling you can't be tickling she can't be tickling we can't be tickling you can't be tickling they can't be tickling
Perfect
I can't have tickled you can't have tickled she can't have tickled we can't have tickled you can't have tickled they can't have tickled
V-ing perfect
I can't have been tickling you can't have been tickling she can't have been tickling we can't have been tickling you can't have been tickling they can't have been tickling
Interrogative form
Simple form
can I tickle? can you tickle? can she tickle? can we tickle? can you tickle? can they tickle?
V-ing form
can I be tickling? can you be tickling? can she be tickling? can we be tickling? can you be tickling? can they be tickling?
Perfect
can I have tickled? can you have tickled? can she have tickled? can we have tickled? can you have tickled? can they have tickled?
V-ing perfect
can I have been tickling? can you have been tickling? can she have been tickling? can we have been tickling? can you have been tickling? can they have been tickling?
Interro-negative form
Simple form
can't I tickle? can't you tickle? can't she tickle? can't we tickle? can't you tickle? can't they tickle?
V-ing form
can't I be tickling? can't you be tickling? can't she be tickling? can't we be tickling? can't you be tickling? can't they be tickling?
Perfect
can't I have tickled? can't you have tickled? can't she have tickled? can't we have tickled? can't you have tickled? can't they have tickled?
V-ing perfect
can't I have been tickling? can't you have been tickling? can't she have been tickling? can't we have been tickling? can't you have been tickling? can't they have been tickling?