English verb conjugation
COULD PINNACLE

Regular verb: pinnacle - pinnacled - pinnacled

Affirmation

Simple form	V-ing form
I could pinnacle you could pinnacle he could pinnacle we could pinnacle you could pinnacle they could pinnacle	I could be pinnacling you could be pinnacling he could be pinnacling we could be pinnacling you could be pinnacling they could be pinnacling
Perfect	V-ing perfect
I could have pinnacled you could have pinnacled he could have pinnacled we could have pinnacled you could have pinnacled they could have pinnacled	I could have been pinnacling you could have been pinnacling he could have been pinnacling we could have been pinnacling you could have been pinnacling they could have been pinnacling

Negation

Simple form	V-ing form
I couldn't pinnacle you couldn't pinnacle he couldn't pinnacle we couldn't pinnacle you couldn't pinnacle they couldn't pinnacle	I couldn't be pinnacling you couldn't be pinnacling he couldn't be pinnacling we couldn't be pinnacling you couldn't be pinnacling they couldn't be pinnacling
Perfect	V-ing perfect
I couldn't have pinnacled you couldn't have pinnacled he couldn't have pinnacled we couldn't have pinnacled you couldn't have pinnacled they couldn't have pinnacled	I couldn't have been pinnacling you couldn't have been pinnacling he couldn't have been pinnacling we couldn't have been pinnacling you couldn't have been pinnacling they couldn't have been pinnacling

Interrogative form

Simple form	V-ing form
could I pinnacle? could you pinnacle? could he pinnacle? could we pinnacle? could you pinnacle? could they pinnacle?	could I be pinnacling? could you be pinnacling? could he be pinnacling? could we be pinnacling? could you be pinnacling? could they be pinnacling?
Perfect	V-ing perfect
could I have pinnacled? could you have pinnacled? could he have pinnacled? could we have pinnacled? could you have pinnacled? could they have pinnacled?	could I have been pinnacling? could you have been pinnacling? could he have been pinnacling? could we have been pinnacling? could you have been pinnacling? could they have been pinnacling?

Interro-negative form

Simple form	V-ing form
couldn't I pinnacle? couldn't you pinnacle? couldn't he pinnacle? couldn't we pinnacle? couldn't you pinnacle? couldn't they pinnacle?	couldn't I be pinnacling? couldn't you be pinnacling? couldn't he be pinnacling? couldn't we be pinnacling? couldn't you be pinnacling? couldn't they be pinnacling?
Perfect	V-ing perfect
couldn't I have pinnacled? couldn't you have pinnacled? couldn't he have pinnacled? couldn't we have pinnacled? couldn't you have pinnacled? couldn't they have pinnacled?	couldn't I have been pinnacling? couldn't you have been pinnacling? couldn't he have been pinnacling? couldn't we have been pinnacling? couldn't you have been pinnacling? couldn't they have been pinnacling?