I can pick you can pick she can pick we can pick you can pick they can pick
V-ing form
I can be picking you can be picking she can be picking we can be picking you can be picking they can be picking
Perfect
I can have picked you can have picked she can have picked we can have picked you can have picked they can have picked
V-ing perfect
I can have been picking you can have been picking she can have been picking we can have been picking you can have been picking they can have been picking
Negation
Simple form
I can't pick you can't pick she can't pick we can't pick you can't pick they can't pick
V-ing form
I can't be picking you can't be picking she can't be picking we can't be picking you can't be picking they can't be picking
Perfect
I can't have picked you can't have picked she can't have picked we can't have picked you can't have picked they can't have picked
V-ing perfect
I can't have been picking you can't have been picking she can't have been picking we can't have been picking you can't have been picking they can't have been picking
Interrogative form
Simple form
can I pick? can you pick? can she pick? can we pick? can you pick? can they pick?
V-ing form
can I be picking? can you be picking? can she be picking? can we be picking? can you be picking? can they be picking?
Perfect
can I have picked? can you have picked? can she have picked? can we have picked? can you have picked? can they have picked?
V-ing perfect
can I have been picking? can you have been picking? can she have been picking? can we have been picking? can you have been picking? can they have been picking?
Interro-negative form
Simple form
can't I pick? can't you pick? can't she pick? can't we pick? can't you pick? can't they pick?
V-ing form
can't I be picking? can't you be picking? can't she be picking? can't we be picking? can't you be picking? can't they be picking?
Perfect
can't I have picked? can't you have picked? can't she have picked? can't we have picked? can't you have picked? can't they have picked?
V-ing perfect
can't I have been picking? can't you have been picking? can't she have been picking? can't we have been picking? can't you have been picking? can't they have been picking?