I can creep you can creep he can creep we can creep you can creep they can creep
V-ing form
I can be creeping you can be creeping he can be creeping we can be creeping you can be creeping they can be creeping
Perfect
I can have crept you can have crept he can have crept we can have crept you can have crept they can have crept
V-ing perfect
I can have been creeping you can have been creeping he can have been creeping we can have been creeping you can have been creeping they can have been creeping
Negation
Simple form
I can't creep you can't creep he can't creep we can't creep you can't creep they can't creep
V-ing form
I can't be creeping you can't be creeping he can't be creeping we can't be creeping you can't be creeping they can't be creeping
Perfect
I can't have crept you can't have crept he can't have crept we can't have crept you can't have crept they can't have crept
V-ing perfect
I can't have been creeping you can't have been creeping he can't have been creeping we can't have been creeping you can't have been creeping they can't have been creeping
Interrogative form
Simple form
can I creep? can you creep? can he creep? can we creep? can you creep? can they creep?
V-ing form
can I be creeping? can you be creeping? can he be creeping? can we be creeping? can you be creeping? can they be creeping?
Perfect
can I have crept? can you have crept? can he have crept? can we have crept? can you have crept? can they have crept?
V-ing perfect
can I have been creeping? can you have been creeping? can he have been creeping? can we have been creeping? can you have been creeping? can they have been creeping?
Interro-negative form
Simple form
can't I creep? can't you creep? can't he creep? can't we creep? can't you creep? can't they creep?
V-ing form
can't I be creeping? can't you be creeping? can't he be creeping? can't we be creeping? can't you be creeping? can't they be creeping?
Perfect
can't I have crept? can't you have crept? can't he have crept? can't we have crept? can't you have crept? can't they have crept?
V-ing perfect
can't I have been creeping? can't you have been creeping? can't he have been creeping? can't we have been creeping? can't you have been creeping? can't they have been creeping?