English verb conjugation
COULD STARCH

Regular verb: starch - starched - starched

Affirmation

Simple form	V-ing form
I could starch you could starch he could starch we could starch you could starch they could starch	I could be starching you could be starching he could be starching we could be starching you could be starching they could be starching
Perfect	V-ing perfect
I could have starched you could have starched he could have starched we could have starched you could have starched they could have starched	I could have been starching you could have been starching he could have been starching we could have been starching you could have been starching they could have been starching

Negation

Simple form	V-ing form
I couldn't starch you couldn't starch he couldn't starch we couldn't starch you couldn't starch they couldn't starch	I couldn't be starching you couldn't be starching he couldn't be starching we couldn't be starching you couldn't be starching they couldn't be starching
Perfect	V-ing perfect
I couldn't have starched you couldn't have starched he couldn't have starched we couldn't have starched you couldn't have starched they couldn't have starched	I couldn't have been starching you couldn't have been starching he couldn't have been starching we couldn't have been starching you couldn't have been starching they couldn't have been starching

Interrogative form

Simple form	V-ing form
could I starch? could you starch? could he starch? could we starch? could you starch? could they starch?	could I be starching? could you be starching? could he be starching? could we be starching? could you be starching? could they be starching?
Perfect	V-ing perfect
could I have starched? could you have starched? could he have starched? could we have starched? could you have starched? could they have starched?	could I have been starching? could you have been starching? could he have been starching? could we have been starching? could you have been starching? could they have been starching?

Interro-negative form

Simple form	V-ing form
couldn't I starch? couldn't you starch? couldn't he starch? couldn't we starch? couldn't you starch? couldn't they starch?	couldn't I be starching? couldn't you be starching? couldn't he be starching? couldn't we be starching? couldn't you be starching? couldn't they be starching?
Perfect	V-ing perfect
couldn't I have starched? couldn't you have starched? couldn't he have starched? couldn't we have starched? couldn't you have starched? couldn't they have starched?	couldn't I have been starching? couldn't you have been starching? couldn't he have been starching? couldn't we have been starching? couldn't you have been starching? couldn't they have been starching?