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