English verb conjugation
COULD PERCEIVE

Regular verb: perceive - perceived - perceived

Affirmation

Simple form	V-ing form
I could perceive you could perceive he could perceive we could perceive you could perceive they could perceive	I could be perceiving you could be perceiving he could be perceiving we could be perceiving you could be perceiving they could be perceiving
Perfect	V-ing perfect
I could have perceived you could have perceived he could have perceived we could have perceived you could have perceived they could have perceived	I could have been perceiving you could have been perceiving he could have been perceiving we could have been perceiving you could have been perceiving they could have been perceiving

Negation

Simple form	V-ing form
I couldn't perceive you couldn't perceive he couldn't perceive we couldn't perceive you couldn't perceive they couldn't perceive	I couldn't be perceiving you couldn't be perceiving he couldn't be perceiving we couldn't be perceiving you couldn't be perceiving they couldn't be perceiving
Perfect	V-ing perfect
I couldn't have perceived you couldn't have perceived he couldn't have perceived we couldn't have perceived you couldn't have perceived they couldn't have perceived	I couldn't have been perceiving you couldn't have been perceiving he couldn't have been perceiving we couldn't have been perceiving you couldn't have been perceiving they couldn't have been perceiving

Interrogative form

Simple form	V-ing form
could I perceive? could you perceive? could he perceive? could we perceive? could you perceive? could they perceive?	could I be perceiving? could you be perceiving? could he be perceiving? could we be perceiving? could you be perceiving? could they be perceiving?
Perfect	V-ing perfect
could I have perceived? could you have perceived? could he have perceived? could we have perceived? could you have perceived? could they have perceived?	could I have been perceiving? could you have been perceiving? could he have been perceiving? could we have been perceiving? could you have been perceiving? could they have been perceiving?

Interro-negative form

Simple form	V-ing form
couldn't I perceive? couldn't you perceive? couldn't he perceive? couldn't we perceive? couldn't you perceive? couldn't they perceive?	couldn't I be perceiving? couldn't you be perceiving? couldn't he be perceiving? couldn't we be perceiving? couldn't you be perceiving? couldn't they be perceiving?
Perfect	V-ing perfect
couldn't I have perceived? couldn't you have perceived? couldn't he have perceived? couldn't we have perceived? couldn't you have perceived? couldn't they have perceived?	couldn't I have been perceiving? couldn't you have been perceiving? couldn't he have been perceiving? couldn't we have been perceiving? couldn't you have been perceiving? couldn't they have been perceiving?