can lowercase
Regular verb: lowercase - lowercased- lowercased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can lowercase
you can lowercase
he can lowercase
we can lowercase
you can lowercase
they can lowercase 	I can be lowercasing
you can be lowercasing
he can be lowercasing
we can be lowercasing
you can be lowercasing
they can be lowercasing	I can have lowercased
you can have lowercased
he can have lowercased
we can have lowercased
you can have lowercased
they can have lowercased	I can have been lowercasing
you can have been lowercasing
he can have been lowercasing
we can have been lowercasing
you can have been lowercasing
they can have been lowercasing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot lowercase
you cannot lowercase
he cannot lowercase
we cannot lowercase
you cannot lowercase
they cannot lowercase 	I cannot be lowercasing
you cannot be lowercasing
he cannot be lowercasing
we cannot be lowercasing
you cannot be lowercasing
they cannot be lowercasing	I cannot have lowercased
you cannot have lowercased
he cannot have lowercased
we cannot have lowercased
you cannot have lowercased
they cannot have lowercased	I cannot have been lowercasing
you cannot have been lowercasing
he cannot have been lowercasing
we cannot have been lowercasing
you cannot have been lowercasing
they cannot have been lowercasing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I lowercase?
can you lowercase?
can he lowercase?
can we lowercase?
can you lowercase?
can they lowercase? 	can I be lowercasing?
can you be lowercasing?
can he be lowercasing?
can we be lowercasing?
can you be lowercasing?
can they be lowercasing? 	can I have lowercased?
can you have lowercased?
can he have lowercased?
can we have lowercased?
can you have lowercased?
can they have lowercased? 	can I have been lowercasing?
can you have been lowercasing?
can he have been lowercasing?
can we have been lowercasing?
can you have been lowercasing?
can they have been lowercasing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not lowercase?
can you not lowercase?
can he not lowercase?
can we not lowercase?
can you not lowercase?
can they not lowercase? 	can I not be lowercasing?
can you not be lowercasing?
can he not be lowercasing?
can we not be lowercasing?
can you not be lowercasing?
can they not be lowercasing? 	can I not have lowercased?
can you not have lowercased?
can he not have lowercased?
can we not have lowercased?
can you not have lowercased?
can they not have lowercased? 	can I not have been lowercasing?
can you not have been lowercasing?
can he not have been lowercasing?
can we not have been lowercasing?
can you not have been lowercasing?
can they not have been lowercasing?