can trill
Regular verb: trill - trilled- trilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can trill
you can trill
she can trill
we can trill
you can trill
they can trill 	I can be trilling
you can be trilling
she can be trilling
we can be trilling
you can be trilling
they can be trilling	I can have trilled
you can have trilled
she can have trilled
we can have trilled
you can have trilled
they can have trilled	I can have been trilling
you can have been trilling
she can have been trilling
we can have been trilling
you can have been trilling
they can have been trilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't trill
you can't trill
she can't trill
we can't trill
you can't trill
they can't trill 	I can't be trilling
you can't be trilling
she can't be trilling
we can't be trilling
you can't be trilling
they can't be trilling	I can't have trilled
you can't have trilled
she can't have trilled
we can't have trilled
you can't have trilled
they can't have trilled	I can't have been trilling
you can't have been trilling
she can't have been trilling
we can't have been trilling
you can't have been trilling
they can't have been trilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I trill?
can you trill?
can she trill?
can we trill?
can you trill?
can they trill? 	can I be trilling?
can you be trilling?
can she be trilling?
can we be trilling?
can you be trilling?
can they be trilling? 	can I have trilled?
can you have trilled?
can she have trilled?
can we have trilled?
can you have trilled?
can they have trilled? 	can I have been trilling?
can you have been trilling?
can she have been trilling?
can we have been trilling?
can you have been trilling?
can they have been trilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I trill?
can't you trill?
can't she trill?
can't we trill?
can't you trill?
can't they trill? 	can't I be trilling?
can't you be trilling?
can't she be trilling?
can't we be trilling?
can't you be trilling?
can't they be trilling? 	can't I have trilled?
can't you have trilled?
can't she have trilled?
can't we have trilled?
can't you have trilled?
can't they have trilled? 	can't I have been trilling?
can't you have been trilling?
can't she have been trilling?
can't we have been trilling?
can't you have been trilling?
can't they have been trilling?