English verb conjugation
CAN RESTACK

Regular verb: restack - restacked - restacked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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