English verb conjugation
COULD MEMORISE

Regular verb: memorise - memorised - memorised

Affirmation

Simple form	V-ing form
I could memorise you could memorise he could memorise we could memorise you could memorise they could memorise	I could be memorising you could be memorising he could be memorising we could be memorising you could be memorising they could be memorising
Perfect	V-ing perfect
I could have memorised you could have memorised he could have memorised we could have memorised you could have memorised they could have memorised	I could have been memorising you could have been memorising he could have been memorising we could have been memorising you could have been memorising they could have been memorising

Negation

Simple form	V-ing form
I couldn't memorise you couldn't memorise he couldn't memorise we couldn't memorise you couldn't memorise they couldn't memorise	I couldn't be memorising you couldn't be memorising he couldn't be memorising we couldn't be memorising you couldn't be memorising they couldn't be memorising
Perfect	V-ing perfect
I couldn't have memorised you couldn't have memorised he couldn't have memorised we couldn't have memorised you couldn't have memorised they couldn't have memorised	I couldn't have been memorising you couldn't have been memorising he couldn't have been memorising we couldn't have been memorising you couldn't have been memorising they couldn't have been memorising

Interrogative form

Simple form	V-ing form
could I memorise? could you memorise? could he memorise? could we memorise? could you memorise? could they memorise?	could I be memorising? could you be memorising? could he be memorising? could we be memorising? could you be memorising? could they be memorising?
Perfect	V-ing perfect
could I have memorised? could you have memorised? could he have memorised? could we have memorised? could you have memorised? could they have memorised?	could I have been memorising? could you have been memorising? could he have been memorising? could we have been memorising? could you have been memorising? could they have been memorising?

Interro-negative form

Simple form	V-ing form
couldn't I memorise? couldn't you memorise? couldn't he memorise? couldn't we memorise? couldn't you memorise? couldn't they memorise?	couldn't I be memorising? couldn't you be memorising? couldn't he be memorising? couldn't we be memorising? couldn't you be memorising? couldn't they be memorising?
Perfect	V-ing perfect
couldn't I have memorised? couldn't you have memorised? couldn't he have memorised? couldn't we have memorised? couldn't you have memorised? couldn't they have memorised?	couldn't I have been memorising? couldn't you have been memorising? couldn't he have been memorising? couldn't we have been memorising? couldn't you have been memorising? couldn't they have been memorising?