I could blanket you could blanket he could blanket we could blanket you could blanket they could blanket
V-ing form
I could be blanketing you could be blanketing he could be blanketing we could be blanketing you could be blanketing they could be blanketing
Perfect
I could have blanketed you could have blanketed he could have blanketed we could have blanketed you could have blanketed they could have blanketed
V-ing perfect
I could have been blanketing you could have been blanketing he could have been blanketing we could have been blanketing you could have been blanketing they could have been blanketing
Negation
Simple form
I couldn't blanket you couldn't blanket he couldn't blanket we couldn't blanket you couldn't blanket they couldn't blanket
V-ing form
I couldn't be blanketing you couldn't be blanketing he couldn't be blanketing we couldn't be blanketing you couldn't be blanketing they couldn't be blanketing
Perfect
I couldn't have blanketed you couldn't have blanketed he couldn't have blanketed we couldn't have blanketed you couldn't have blanketed they couldn't have blanketed
V-ing perfect
I couldn't have been blanketing you couldn't have been blanketing he couldn't have been blanketing we couldn't have been blanketing you couldn't have been blanketing they couldn't have been blanketing
Interrogative form
Simple form
could I blanket? could you blanket? could he blanket? could we blanket? could you blanket? could they blanket?
V-ing form
could I be blanketing? could you be blanketing? could he be blanketing? could we be blanketing? could you be blanketing? could they be blanketing?
Perfect
could I have blanketed? could you have blanketed? could he have blanketed? could we have blanketed? could you have blanketed? could they have blanketed?
V-ing perfect
could I have been blanketing? could you have been blanketing? could he have been blanketing? could we have been blanketing? could you have been blanketing? could they have been blanketing?
Interro-negative form
Simple form
couldn't I blanket? couldn't you blanket? couldn't he blanket? couldn't we blanket? couldn't you blanket? couldn't they blanket?
V-ing form
couldn't I be blanketing? couldn't you be blanketing? couldn't he be blanketing? couldn't we be blanketing? couldn't you be blanketing? couldn't they be blanketing?
Perfect
couldn't I have blanketed? couldn't you have blanketed? couldn't he have blanketed? couldn't we have blanketed? couldn't you have blanketed? couldn't they have blanketed?
V-ing perfect
couldn't I have been blanketing? couldn't you have been blanketing? couldn't he have been blanketing? couldn't we have been blanketing? couldn't you have been blanketing? couldn't they have been blanketing?