English verb conjugation
COULD PERCH

Regular verb: perch - perched - perched

Affirmation

Simple form	V-ing form
I could perch you could perch he could perch we could perch you could perch they could perch	I could be perching you could be perching he could be perching we could be perching you could be perching they could be perching
Perfect	V-ing perfect
I could have perched you could have perched he could have perched we could have perched you could have perched they could have perched	I could have been perching you could have been perching he could have been perching we could have been perching you could have been perching they could have been perching

Negation

Simple form	V-ing form
I couldn't perch you couldn't perch he couldn't perch we couldn't perch you couldn't perch they couldn't perch	I couldn't be perching you couldn't be perching he couldn't be perching we couldn't be perching you couldn't be perching they couldn't be perching
Perfect	V-ing perfect
I couldn't have perched you couldn't have perched he couldn't have perched we couldn't have perched you couldn't have perched they couldn't have perched	I couldn't have been perching you couldn't have been perching he couldn't have been perching we couldn't have been perching you couldn't have been perching they couldn't have been perching

Interrogative form

Simple form	V-ing form
could I perch? could you perch? could he perch? could we perch? could you perch? could they perch?	could I be perching? could you be perching? could he be perching? could we be perching? could you be perching? could they be perching?
Perfect	V-ing perfect
could I have perched? could you have perched? could he have perched? could we have perched? could you have perched? could they have perched?	could I have been perching? could you have been perching? could he have been perching? could we have been perching? could you have been perching? could they have been perching?

Interro-negative form

Simple form	V-ing form
couldn't I perch? couldn't you perch? couldn't he perch? couldn't we perch? couldn't you perch? couldn't they perch?	couldn't I be perching? couldn't you be perching? couldn't he be perching? couldn't we be perching? couldn't you be perching? couldn't they be perching?
Perfect	V-ing perfect
couldn't I have perched? couldn't you have perched? couldn't he have perched? couldn't we have perched? couldn't you have perched? couldn't they have perched?	couldn't I have been perching? couldn't you have been perching? couldn't he have been perching? couldn't we have been perching? couldn't you have been perching? couldn't they have been perching?