can winnow
Regular verb: winnow - winnowed- winnowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can winnow
you can winnow
he can winnow
we can winnow
you can winnow
they can winnow 	I can be winnowing
you can be winnowing
he can be winnowing
we can be winnowing
you can be winnowing
they can be winnowing	I can have winnowed
you can have winnowed
he can have winnowed
we can have winnowed
you can have winnowed
they can have winnowed	I can have been winnowing
you can have been winnowing
he can have been winnowing
we can have been winnowing
you can have been winnowing
they can have been winnowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't winnow
you can't winnow
he can't winnow
we can't winnow
you can't winnow
they can't winnow 	I can't be winnowing
you can't be winnowing
he can't be winnowing
we can't be winnowing
you can't be winnowing
they can't be winnowing	I can't have winnowed
you can't have winnowed
he can't have winnowed
we can't have winnowed
you can't have winnowed
they can't have winnowed	I can't have been winnowing
you can't have been winnowing
he can't have been winnowing
we can't have been winnowing
you can't have been winnowing
they can't have been winnowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I winnow?
can you winnow?
can he winnow?
can we winnow?
can you winnow?
can they winnow? 	can I be winnowing?
can you be winnowing?
can he be winnowing?
can we be winnowing?
can you be winnowing?
can they be winnowing? 	can I have winnowed?
can you have winnowed?
can he have winnowed?
can we have winnowed?
can you have winnowed?
can they have winnowed? 	can I have been winnowing?
can you have been winnowing?
can he have been winnowing?
can we have been winnowing?
can you have been winnowing?
can they have been winnowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I winnow?
can't you winnow?
can't he winnow?
can't we winnow?
can't you winnow?
can't they winnow? 	can't I be winnowing?
can't you be winnowing?
can't he be winnowing?
can't we be winnowing?
can't you be winnowing?
can't they be winnowing? 	can't I have winnowed?
can't you have winnowed?
can't he have winnowed?
can't we have winnowed?
can't you have winnowed?
can't they have winnowed? 	can't I have been winnowing?
can't you have been winnowing?
can't he have been winnowing?
can't we have been winnowing?
can't you have been winnowing?
can't they have been winnowing?