could bog
Regular verb: bog - bogged- bogged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bog
you could bog
she could bog
we could bog
you could bog
they could bog 	I could be bogging
you could be bogging
she could be bogging
we could be bogging
you could be bogging
they could be bogging	I could have bogged
you could have bogged
she could have bogged
we could have bogged
you could have bogged
they could have bogged	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 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bog
you couldn't bog
she couldn't bog
we couldn't bog
you couldn't bog
they couldn't bog 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
could I bog?
could you bog?
could she bog?
could we bog?
could you bog?
could they bog? 	could I be bogging?
could you be bogging?
could she be bogging?
could we be bogging?
could you be bogging?
could they be bogging? 	could I have bogged?
could you have bogged?
could she have bogged?
could we have bogged?
could you have bogged?
could they have bogged? 	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 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I bog?
couldn't you bog?
couldn't she bog?
couldn't we bog?
couldn't you bog?
couldn't they bog? 	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? 	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? 	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?