I could tog you could tog he could tog we could tog you could tog they could tog
V-ing form
I could be togging you could be togging he could be togging we could be togging you could be togging they could be togging
Perfect
I could have togged you could have togged he could have togged we could have togged you could have togged they could have togged
V-ing perfect
I could have been togging you could have been togging he could have been togging we could have been togging you could have been togging they could have been togging
Negation
Simple form
I could not tog you could not tog he could not tog we could not tog you could not tog they could not tog
V-ing form
I could not be togging you could not be togging he could not be togging we could not be togging you could not be togging they could not be togging
Perfect
I could not have togged you could not have togged he could not have togged we could not have togged you could not have togged they could not have togged
V-ing perfect
I could not have been togging you could not have been togging he could not have been togging we could not have been togging you could not have been togging they could not have been togging
Interrogative form
Simple form
could I tog? could you tog? could he tog? could we tog? could you tog? could they tog?
V-ing form
could I be togging? could you be togging? could he be togging? could we be togging? could you be togging? could they be togging?
Perfect
could I have togged? could you have togged? could he have togged? could we have togged? could you have togged? could they have togged?
V-ing perfect
could I have been togging? could you have been togging? could he have been togging? could we have been togging? could you have been togging? could they have been togging?
Interro-negative form
Simple form
could I not tog? could you not tog? could he not tog? could we not tog? could you not tog? could they not tog?
V-ing form
could I not be togging? could you not be togging? could he not be togging? could we not be togging? could you not be togging? could they not be togging?
Perfect
could I not have togged? could you not have togged? could he not have togged? could we not have togged? could you not have togged? could they not have togged?
V-ing perfect
could I not have been togging? could you not have been togging? could he not have been togging? could we not have been togging? could you not have been togging? could they not have been togging?