can concoct
Regular verb: concoct - concocted- concocted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can concoct
you can concoct
he can concoct
we can concoct
you can concoct
they can concoct 	I can be concocting
you can be concocting
he can be concocting
we can be concocting
you can be concocting
they can be concocting	I can have concocted
you can have concocted
he can have concocted
we can have concocted
you can have concocted
they can have concocted	I can have been concocting
you can have been concocting
he can have been concocting
we can have been concocting
you can have been concocting
they can have been concocting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't concoct
you can't concoct
he can't concoct
we can't concoct
you can't concoct
they can't concoct 	I can't be concocting
you can't be concocting
he can't be concocting
we can't be concocting
you can't be concocting
they can't be concocting	I can't have concocted
you can't have concocted
he can't have concocted
we can't have concocted
you can't have concocted
they can't have concocted	I can't have been concocting
you can't have been concocting
he can't have been concocting
we can't have been concocting
you can't have been concocting
they can't have been concocting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I concoct?
can you concoct?
can he concoct?
can we concoct?
can you concoct?
can they concoct? 	can I be concocting?
can you be concocting?
can he be concocting?
can we be concocting?
can you be concocting?
can they be concocting? 	can I have concocted?
can you have concocted?
can he have concocted?
can we have concocted?
can you have concocted?
can they have concocted? 	can I have been concocting?
can you have been concocting?
can he have been concocting?
can we have been concocting?
can you have been concocting?
can they have been concocting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I concoct?
can't you concoct?
can't he concoct?
can't we concoct?
can't you concoct?
can't they concoct? 	can't I be concocting?
can't you be concocting?
can't he be concocting?
can't we be concocting?
can't you be concocting?
can't they be concocting? 	can't I have concocted?
can't you have concocted?
can't he have concocted?
can't we have concocted?
can't you have concocted?
can't they have concocted? 	can't I have been concocting?
can't you have been concocting?
can't he have been concocting?
can't we have been concocting?
can't you have been concocting?
can't they have been concocting?