I could pickaback you could pickaback she could pickaback we could pickaback you could pickaback they could pickaback
V-ing form
I could be pickabacking you could be pickabacking she could be pickabacking we could be pickabacking you could be pickabacking they could be pickabacking
Perfect
I could have pickabacked you could have pickabacked she could have pickabacked we could have pickabacked you could have pickabacked they could have pickabacked
V-ing perfect
I could have been pickabacking you could have been pickabacking she could have been pickabacking we could have been pickabacking you could have been pickabacking they could have been pickabacking
Negation
Simple form
I couldn't pickaback you couldn't pickaback she couldn't pickaback we couldn't pickaback you couldn't pickaback they couldn't pickaback
V-ing form
I couldn't be pickabacking you couldn't be pickabacking she couldn't be pickabacking we couldn't be pickabacking you couldn't be pickabacking they couldn't be pickabacking
Perfect
I couldn't have pickabacked you couldn't have pickabacked she couldn't have pickabacked we couldn't have pickabacked you couldn't have pickabacked they couldn't have pickabacked
V-ing perfect
I couldn't have been pickabacking you couldn't have been pickabacking she couldn't have been pickabacking we couldn't have been pickabacking you couldn't have been pickabacking they couldn't have been pickabacking
Interrogative form
Simple form
could I pickaback? could you pickaback? could she pickaback? could we pickaback? could you pickaback? could they pickaback?
V-ing form
could I be pickabacking? could you be pickabacking? could she be pickabacking? could we be pickabacking? could you be pickabacking? could they be pickabacking?
Perfect
could I have pickabacked? could you have pickabacked? could she have pickabacked? could we have pickabacked? could you have pickabacked? could they have pickabacked?
V-ing perfect
could I have been pickabacking? could you have been pickabacking? could she have been pickabacking? could we have been pickabacking? could you have been pickabacking? could they have been pickabacking?
Interro-negative form
Simple form
couldn't I pickaback? couldn't you pickaback? couldn't she pickaback? couldn't we pickaback? couldn't you pickaback? couldn't they pickaback?
V-ing form
couldn't I be pickabacking? couldn't you be pickabacking? couldn't she be pickabacking? couldn't we be pickabacking? couldn't you be pickabacking? couldn't they be pickabacking?
Perfect
couldn't I have pickabacked? couldn't you have pickabacked? couldn't she have pickabacked? couldn't we have pickabacked? couldn't you have pickabacked? couldn't they have pickabacked?
V-ing perfect
couldn't I have been pickabacking? couldn't you have been pickabacking? couldn't she have been pickabacking? couldn't we have been pickabacking? couldn't you have been pickabacking? couldn't they have been pickabacking?