English verb conjugation
COULD MEMORIZE

Regular verb: memorize - memorized - memorized

Affirmation

Simple form	V-ing form
I could memorize you could memorize he could memorize we could memorize you could memorize they could memorize	I could be memorizing you could be memorizing he could be memorizing we could be memorizing you could be memorizing they could be memorizing
Perfect	V-ing perfect
I could have memorized you could have memorized he could have memorized we could have memorized you could have memorized they could have memorized	I could have been memorizing you could have been memorizing he could have been memorizing we could have been memorizing you could have been memorizing they could have been memorizing

Negation

Simple form	V-ing form
I couldn't memorize you couldn't memorize he couldn't memorize we couldn't memorize you couldn't memorize they couldn't memorize	I couldn't be memorizing you couldn't be memorizing he couldn't be memorizing we couldn't be memorizing you couldn't be memorizing they couldn't be memorizing
Perfect	V-ing perfect
I couldn't have memorized you couldn't have memorized he couldn't have memorized we couldn't have memorized you couldn't have memorized they couldn't have memorized	I couldn't have been memorizing you couldn't have been memorizing he couldn't have been memorizing we couldn't have been memorizing you couldn't have been memorizing they couldn't have been memorizing

Interrogative form

Simple form	V-ing form
could I memorize? could you memorize? could he memorize? could we memorize? could you memorize? could they memorize?	could I be memorizing? could you be memorizing? could he be memorizing? could we be memorizing? could you be memorizing? could they be memorizing?
Perfect	V-ing perfect
could I have memorized? could you have memorized? could he have memorized? could we have memorized? could you have memorized? could they have memorized?	could I have been memorizing? could you have been memorizing? could he have been memorizing? could we have been memorizing? could you have been memorizing? could they have been memorizing?

Interro-negative form

Simple form	V-ing form
couldn't I memorize? couldn't you memorize? couldn't he memorize? couldn't we memorize? couldn't you memorize? couldn't they memorize?	couldn't I be memorizing? couldn't you be memorizing? couldn't he be memorizing? couldn't we be memorizing? couldn't you be memorizing? couldn't they be memorizing?
Perfect	V-ing perfect
couldn't I have memorized? couldn't you have memorized? couldn't he have memorized? couldn't we have memorized? couldn't you have memorized? couldn't they have memorized?	couldn't I have been memorizing? couldn't you have been memorizing? couldn't he have been memorizing? couldn't we have been memorizing? couldn't you have been memorizing? couldn't they have been memorizing?