I could hug you could hug he could hug we could hug you could hug they could hug
V-ing form
I could be hugging you could be hugging he could be hugging we could be hugging you could be hugging they could be hugging
Perfect
I could have hugged you could have hugged he could have hugged we could have hugged you could have hugged they could have hugged
V-ing perfect
I could have been hugging you could have been hugging he could have been hugging we could have been hugging you could have been hugging they could have been hugging
Negation
Simple form
I couldn't hug you couldn't hug he couldn't hug we couldn't hug you couldn't hug they couldn't hug
V-ing form
I couldn't be hugging you couldn't be hugging he couldn't be hugging we couldn't be hugging you couldn't be hugging they couldn't be hugging
Perfect
I couldn't have hugged you couldn't have hugged he couldn't have hugged we couldn't have hugged you couldn't have hugged they couldn't have hugged
V-ing perfect
I couldn't have been hugging you couldn't have been hugging he couldn't have been hugging we couldn't have been hugging you couldn't have been hugging they couldn't have been hugging
Interrogative form
Simple form
could I hug? could you hug? could he hug? could we hug? could you hug? could they hug?
V-ing form
could I be hugging? could you be hugging? could he be hugging? could we be hugging? could you be hugging? could they be hugging?
Perfect
could I have hugged? could you have hugged? could he have hugged? could we have hugged? could you have hugged? could they have hugged?
V-ing perfect
could I have been hugging? could you have been hugging? could he have been hugging? could we have been hugging? could you have been hugging? could they have been hugging?
Interro-negative form
Simple form
couldn't I hug? couldn't you hug? couldn't he hug? couldn't we hug? couldn't you hug? couldn't they hug?
V-ing form
couldn't I be hugging? couldn't you be hugging? couldn't he be hugging? couldn't we be hugging? couldn't you be hugging? couldn't they be hugging?
Perfect
couldn't I have hugged? couldn't you have hugged? couldn't he have hugged? couldn't we have hugged? couldn't you have hugged? couldn't they have hugged?
V-ing perfect
couldn't I have been hugging? couldn't you have been hugging? couldn't he have been hugging? couldn't we have been hugging? couldn't you have been hugging? couldn't they have been hugging?