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