English verb conjugation
COULD PARSE

Regular verb: parse - parsed - parsed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not parse you could not parse he could not parse we could not parse you could not parse they could not parse	I could not be parsing you could not be parsing he could not be parsing we could not be parsing you could not be parsing they could not be parsing
Perfect	V-ing perfect
I could not have parsed you could not have parsed he could not have parsed we could not have parsed you could not have parsed they could not have parsed	I could not have been parsing you could not have been parsing he could not have been parsing we could not have been parsing you could not have been parsing they could not have been parsing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not parse? could you not parse? could he not parse? could we not parse? could you not parse? could they not parse?	could I not be parsing? could you not be parsing? could he not be parsing? could we not be parsing? could you not be parsing? could they not be parsing?
Perfect	V-ing perfect
could I not have parsed? could you not have parsed? could he not have parsed? could we not have parsed? could you not have parsed? could they not have parsed?	could I not have been parsing? could you not have been parsing? could he not have been parsing? could we not have been parsing? could you not have been parsing? could they not have been parsing?