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