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 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
Perfect	V-ing perfect
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
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
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?
Perfect	V-ing perfect
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?