English verb conjugation
COULD RESTACK

Regular verb: restack - restacked - restacked

Affirmation

Simple form	V-ing form
I could restack you could restack he could restack we could restack you could restack they could restack	I could be restacking you could be restacking he could be restacking we could be restacking you could be restacking they could be restacking
Perfect	V-ing perfect
I could have restacked you could have restacked he could have restacked we could have restacked you could have restacked they could have restacked	I could have been restacking you could have been restacking he could have been restacking we could have been restacking you could have been restacking they could have been restacking

Negation

Simple form	V-ing form
I couldn't restack you couldn't restack he couldn't restack we couldn't restack you couldn't restack they couldn't restack	I couldn't be restacking you couldn't be restacking he couldn't be restacking we couldn't be restacking you couldn't be restacking they couldn't be restacking
Perfect	V-ing perfect
I couldn't have restacked you couldn't have restacked he couldn't have restacked we couldn't have restacked you couldn't have restacked they couldn't have restacked	I couldn't have been restacking you couldn't have been restacking he couldn't have been restacking we couldn't have been restacking you couldn't have been restacking they couldn't have been restacking

Interrogative form

Simple form	V-ing form
could I restack? could you restack? could he restack? could we restack? could you restack? could they restack?	could I be restacking? could you be restacking? could he be restacking? could we be restacking? could you be restacking? could they be restacking?
Perfect	V-ing perfect
could I have restacked? could you have restacked? could he have restacked? could we have restacked? could you have restacked? could they have restacked?	could I have been restacking? could you have been restacking? could he have been restacking? could we have been restacking? could you have been restacking? could they have been restacking?

Interro-negative form

Simple form	V-ing form
couldn't I restack? couldn't you restack? couldn't he restack? couldn't we restack? couldn't you restack? couldn't they restack?	couldn't I be restacking? couldn't you be restacking? couldn't he be restacking? couldn't we be restacking? couldn't you be restacking? couldn't they be restacking?
Perfect	V-ing perfect
couldn't I have restacked? couldn't you have restacked? couldn't he have restacked? couldn't we have restacked? couldn't you have restacked? couldn't they have restacked?	couldn't I have been restacking? couldn't you have been restacking? couldn't he have been restacking? couldn't we have been restacking? couldn't you have been restacking? couldn't they have been restacking?