could parse
Regular verb: parse - parsed- parsed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could parse
you could parse
he could parse
we could parse
you could parse
they could parse 	I could be parsing
you could be parsing
he could be parsing
we could be parsing
you could be parsing
they could be parsing	I could have parsed
you could have parsed
he could have parsed
we could have parsed
you could have parsed
they could have parsed	I could have been parsing
you could have been parsing
he could have been parsing
we could have been parsing
you could have been parsing
they could have been parsing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't parse
you couldn't parse
he couldn't parse
we couldn't parse
you couldn't parse
they couldn't parse 	I couldn't be parsing
you couldn't be parsing
he couldn't be parsing
we couldn't be parsing
you couldn't be parsing
they couldn't be parsing	I couldn't have parsed
you couldn't have parsed
he couldn't have parsed
we couldn't have parsed
you couldn't have parsed
they couldn't have parsed	I couldn't have been parsing
you couldn't have been parsing
he couldn't have been parsing
we couldn't have been parsing
you couldn't have been parsing
they couldn't have been parsing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I parse?
could you parse?
could he parse?
could we parse?
could you parse?
could they parse? 	could I be parsing?
could you be parsing?
could he be parsing?
could we be parsing?
could you be parsing?
could they be parsing? 	could I have parsed?
could you have parsed?
could he have parsed?
could we have parsed?
could you have parsed?
could they have parsed? 	could I have been parsing?
could you have been parsing?
could he have been parsing?
could we have been parsing?
could you have been parsing?
could they have been parsing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I parse?
couldn't you parse?
couldn't he parse?
couldn't we parse?
couldn't you parse?
couldn't they parse? 	couldn't I be parsing?
couldn't you be parsing?
couldn't he be parsing?
couldn't we be parsing?
couldn't you be parsing?
couldn't they be parsing? 	couldn't I have parsed?
couldn't you have parsed?
couldn't he have parsed?
couldn't we have parsed?
couldn't you have parsed?
couldn't they have parsed? 	couldn't I have been parsing?
couldn't you have been parsing?
couldn't he have been parsing?
couldn't we have been parsing?
couldn't you have been parsing?
couldn't they have been parsing?