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