can fumble
Regular verb: fumble - fumbled- fumbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can fumble
you can fumble
she can fumble
we can fumble
you can fumble
they can fumble 	I can be fumbling
you can be fumbling
she can be fumbling
we can be fumbling
you can be fumbling
they can be fumbling	I can have fumbled
you can have fumbled
she can have fumbled
we can have fumbled
you can have fumbled
they can have fumbled	I can have been fumbling
you can have been fumbling
she can have been fumbling
we can have been fumbling
you can have been fumbling
they can have been fumbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't fumble
you can't fumble
she can't fumble
we can't fumble
you can't fumble
they can't fumble 	I can't be fumbling
you can't be fumbling
she can't be fumbling
we can't be fumbling
you can't be fumbling
they can't be fumbling	I can't have fumbled
you can't have fumbled
she can't have fumbled
we can't have fumbled
you can't have fumbled
they can't have fumbled	I can't have been fumbling
you can't have been fumbling
she can't have been fumbling
we can't have been fumbling
you can't have been fumbling
they can't have been fumbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I fumble?
can you fumble?
can she fumble?
can we fumble?
can you fumble?
can they fumble? 	can I be fumbling?
can you be fumbling?
can she be fumbling?
can we be fumbling?
can you be fumbling?
can they be fumbling? 	can I have fumbled?
can you have fumbled?
can she have fumbled?
can we have fumbled?
can you have fumbled?
can they have fumbled? 	can I have been fumbling?
can you have been fumbling?
can she have been fumbling?
can we have been fumbling?
can you have been fumbling?
can they have been fumbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I fumble?
can't you fumble?
can't she fumble?
can't we fumble?
can't you fumble?
can't they fumble? 	can't I be fumbling?
can't you be fumbling?
can't she be fumbling?
can't we be fumbling?
can't you be fumbling?
can't they be fumbling? 	can't I have fumbled?
can't you have fumbled?
can't she have fumbled?
can't we have fumbled?
can't you have fumbled?
can't they have fumbled? 	can't I have been fumbling?
can't you have been fumbling?
can't she have been fumbling?
can't we have been fumbling?
can't you have been fumbling?
can't they have been fumbling?