Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I can speak. talk you can speak. talk she can speak. talk we can speak. talk you can speak. talk they can speak. talk
V-ing form
I can be speak. talking you can be speak. talking she can be speak. talking we can be speak. talking you can be speak. talking they can be speak. talking
Perfect
I can have speak. talked you can have speak. talked she can have speak. talked we can have speak. talked you can have speak. talked they can have speak. talked
V-ing perfect
I can have been speak. talking you can have been speak. talking she can have been speak. talking we can have been speak. talking you can have been speak. talking they can have been speak. talking
Negation
Simple form
I can't speak. talk you can't speak. talk she can't speak. talk we can't speak. talk you can't speak. talk they can't speak. talk
V-ing form
I can't be speak. talking you can't be speak. talking she can't be speak. talking we can't be speak. talking you can't be speak. talking they can't be speak. talking
Perfect
I can't have speak. talked you can't have speak. talked she can't have speak. talked we can't have speak. talked you can't have speak. talked they can't have speak. talked
V-ing perfect
I can't have been speak. talking you can't have been speak. talking she can't have been speak. talking we can't have been speak. talking you can't have been speak. talking they can't have been speak. talking
Interrogative form
Simple form
can I speak. talk? can you speak. talk? can she speak. talk? can we speak. talk? can you speak. talk? can they speak. talk?
V-ing form
can I be speak. talking? can you be speak. talking? can she be speak. talking? can we be speak. talking? can you be speak. talking? can they be speak. talking?
Perfect
can I have speak. talked? can you have speak. talked? can she have speak. talked? can we have speak. talked? can you have speak. talked? can they have speak. talked?
V-ing perfect
can I have been speak. talking? can you have been speak. talking? can she have been speak. talking? can we have been speak. talking? can you have been speak. talking? can they have been speak. talking?
Interro-negative form
Simple form
can't I speak. talk? can't you speak. talk? can't she speak. talk? can't we speak. talk? can't you speak. talk? can't they speak. talk?
V-ing form
can't I be speak. talking? can't you be speak. talking? can't she be speak. talking? can't we be speak. talking? can't you be speak. talking? can't they be speak. talking?
Perfect
can't I have speak. talked? can't you have speak. talked? can't she have speak. talked? can't we have speak. talked? can't you have speak. talked? can't they have speak. talked?
V-ing perfect
can't I have been speak. talking? can't you have been speak. talking? can't she have been speak. talking? can't we have been speak. talking? can't you have been speak. talking? can't they have been speak. talking?