Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could select select you could select select she could select select we could select select you could select select they could select select
V-ing form
I could be select selecting you could be select selecting she could be select selecting we could be select selecting you could be select selecting they could be select selecting
Perfect
I could have select selected you could have select selected she could have select selected we could have select selected you could have select selected they could have select selected
V-ing perfect
I could have been select selecting you could have been select selecting she could have been select selecting we could have been select selecting you could have been select selecting they could have been select selecting
Negation
Simple form
I couldn't select select you couldn't select select she couldn't select select we couldn't select select you couldn't select select they couldn't select select
V-ing form
I couldn't be select selecting you couldn't be select selecting she couldn't be select selecting we couldn't be select selecting you couldn't be select selecting they couldn't be select selecting
Perfect
I couldn't have select selected you couldn't have select selected she couldn't have select selected we couldn't have select selected you couldn't have select selected they couldn't have select selected
V-ing perfect
I couldn't have been select selecting you couldn't have been select selecting she couldn't have been select selecting we couldn't have been select selecting you couldn't have been select selecting they couldn't have been select selecting
Interrogative form
Simple form
could I select select? could you select select? could she select select? could we select select? could you select select? could they select select?
V-ing form
could I be select selecting? could you be select selecting? could she be select selecting? could we be select selecting? could you be select selecting? could they be select selecting?
Perfect
could I have select selected? could you have select selected? could she have select selected? could we have select selected? could you have select selected? could they have select selected?
V-ing perfect
could I have been select selecting? could you have been select selecting? could she have been select selecting? could we have been select selecting? could you have been select selecting? could they have been select selecting?
Interro-negative form
Simple form
couldn't I select select? couldn't you select select? couldn't she select select? couldn't we select select? couldn't you select select? couldn't they select select?
V-ing form
couldn't I be select selecting? couldn't you be select selecting? couldn't she be select selecting? couldn't we be select selecting? couldn't you be select selecting? couldn't they be select selecting?
Perfect
couldn't I have select selected? couldn't you have select selected? couldn't she have select selected? couldn't we have select selected? couldn't you have select selected? couldn't they have select selected?
V-ing perfect
couldn't I have been select selecting? couldn't you have been select selecting? couldn't she have been select selecting? couldn't we have been select selecting? couldn't you have been select selecting? couldn't they have been select selecting?