can speak
Irregular verb: speak - spoke- spoken, spoke

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can speak
you can speak
he can speak
we can speak
you can speak
they can speak 	I can be speaking
you can be speaking
he can be speaking
we can be speaking
you can be speaking
they can be speaking	I can have spoken, spoke
you can have spoken, spoke
he can have spoken, spoke
we can have spoken, spoke
you can have spoken, spoke
they can have spoken, spoke	I can have been speaking
you can have been speaking
he can have been speaking
we can have been speaking
you can have been speaking
they can have been speaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't speak
you can't speak
he can't speak
we can't speak
you can't speak
they can't speak 	I can't be speaking
you can't be speaking
he can't be speaking
we can't be speaking
you can't be speaking
they can't be speaking	I can't have spoken, spoke
you can't have spoken, spoke
he can't have spoken, spoke
we can't have spoken, spoke
you can't have spoken, spoke
they can't have spoken, spoke	I can't have been speaking
you can't have been speaking
he can't have been speaking
we can't have been speaking
you can't have been speaking
they can't have been speaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I speak?
can you speak?
can he speak?
can we speak?
can you speak?
can they speak? 	can I be speaking?
can you be speaking?
can he be speaking?
can we be speaking?
can you be speaking?
can they be speaking? 	can I have spoken, spoke?
can you have spoken, spoke?
can he have spoken, spoke?
can we have spoken, spoke?
can you have spoken, spoke?
can they have spoken, spoke? 	can I have been speaking?
can you have been speaking?
can he have been speaking?
can we have been speaking?
can you have been speaking?
can they have been speaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I speak?
can't you speak?
can't he speak?
can't we speak?
can't you speak?
can't they speak? 	can't I be speaking?
can't you be speaking?
can't he be speaking?
can't we be speaking?
can't you be speaking?
can't they be speaking? 	can't I have spoken, spoke?
can't you have spoken, spoke?
can't he have spoken, spoke?
can't we have spoken, spoke?
can't you have spoken, spoke?
can't they have spoken, spoke? 	can't I have been speaking?
can't you have been speaking?
can't he have been speaking?
can't we have been speaking?
can't you have been speaking?
can't they have been speaking?