I could garter you could garter he could garter we could garter you could garter they could garter
V-ing form
I could be gartering you could be gartering he could be gartering we could be gartering you could be gartering they could be gartering
Perfect
I could have gartered you could have gartered he could have gartered we could have gartered you could have gartered they could have gartered
V-ing perfect
I could have been gartering you could have been gartering he could have been gartering we could have been gartering you could have been gartering they could have been gartering
Negation
Simple form
I could not garter you could not garter he could not garter we could not garter you could not garter they could not garter
V-ing form
I could not be gartering you could not be gartering he could not be gartering we could not be gartering you could not be gartering they could not be gartering
Perfect
I could not have gartered you could not have gartered he could not have gartered we could not have gartered you could not have gartered they could not have gartered
V-ing perfect
I could not have been gartering you could not have been gartering he could not have been gartering we could not have been gartering you could not have been gartering they could not have been gartering
Interrogative form
Simple form
could I garter? could you garter? could he garter? could we garter? could you garter? could they garter?
V-ing form
could I be gartering? could you be gartering? could he be gartering? could we be gartering? could you be gartering? could they be gartering?
Perfect
could I have gartered? could you have gartered? could he have gartered? could we have gartered? could you have gartered? could they have gartered?
V-ing perfect
could I have been gartering? could you have been gartering? could he have been gartering? could we have been gartering? could you have been gartering? could they have been gartering?
Interro-negative form
Simple form
could I not garter? could you not garter? could he not garter? could we not garter? could you not garter? could they not garter?
V-ing form
could I not be gartering? could you not be gartering? could he not be gartering? could we not be gartering? could you not be gartering? could they not be gartering?
Perfect
could I not have gartered? could you not have gartered? could he not have gartered? could we not have gartered? could you not have gartered? could they not have gartered?
V-ing perfect
could I not have been gartering? could you not have been gartering? could he not have been gartering? could we not have been gartering? could you not have been gartering? could they not have been gartering?