could startle
Regular verb: startle - startled- startled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could startle
you could startle
he could startle
we could startle
you could startle
they could startle 	I could be startling
you could be startling
he could be startling
we could be startling
you could be startling
they could be startling	I could have startled
you could have startled
he could have startled
we could have startled
you could have startled
they could have startled	I could have been startling
you could have been startling
he could have been startling
we could have been startling
you could have been startling
they could have been startling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not startle
you could not startle
he could not startle
we could not startle
you could not startle
they could not startle 	I could not be startling
you could not be startling
he could not be startling
we could not be startling
you could not be startling
they could not be startling	I could not have startled
you could not have startled
he could not have startled
we could not have startled
you could not have startled
they could not have startled	I could not have been startling
you could not have been startling
he could not have been startling
we could not have been startling
you could not have been startling
they could not have been startling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I startle?
could you startle?
could he startle?
could we startle?
could you startle?
could they startle? 	could I be startling?
could you be startling?
could he be startling?
could we be startling?
could you be startling?
could they be startling? 	could I have startled?
could you have startled?
could he have startled?
could we have startled?
could you have startled?
could they have startled? 	could I have been startling?
could you have been startling?
could he have been startling?
could we have been startling?
could you have been startling?
could they have been startling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not startle?
could you not startle?
could he not startle?
could we not startle?
could you not startle?
could they not startle? 	could I not be startling?
could you not be startling?
could he not be startling?
could we not be startling?
could you not be startling?
could they not be startling? 	could I not have startled?
could you not have startled?
could he not have startled?
could we not have startled?
could you not have startled?
could they not have startled? 	could I not have been startling?
could you not have been startling?
could he not have been startling?
could we not have been startling?
could you not have been startling?
could they not have been startling?