I can pick you can pick he can pick we can pick you can pick they can pick
V-ing form
I can be picking you can be picking he can be picking we can be picking you can be picking they can be picking
Perfect
I can have picked you can have picked he 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 he 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 he 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 he 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 he 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 he 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 he pick? can we pick? can you pick? can they pick?
V-ing form
can I be picking? can you be picking? can he be picking? can we be picking? can you be picking? can they be picking?
Perfect
can I have picked? can you have picked? can he 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 he 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 he 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 he 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 he 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 he have been picking? can't we have been picking? can't you have been picking? can't they have been picking?