English verb conjugation
COULD MUFFLE

Regular verb: muffle - muffled - muffled

Affirmation

Simple form	V-ing form
I could muffle you could muffle he could muffle we could muffle you could muffle they could muffle	I could be muffling you could be muffling he could be muffling we could be muffling you could be muffling they could be muffling
Perfect	V-ing perfect
I could have muffled you could have muffled he could have muffled we could have muffled you could have muffled they could have muffled	I could have been muffling you could have been muffling he could have been muffling we could have been muffling you could have been muffling they could have been muffling

Negation

Simple form	V-ing form
I couldn't muffle you couldn't muffle he couldn't muffle we couldn't muffle you couldn't muffle they couldn't muffle	I couldn't be muffling you couldn't be muffling he couldn't be muffling we couldn't be muffling you couldn't be muffling they couldn't be muffling
Perfect	V-ing perfect
I couldn't have muffled you couldn't have muffled he couldn't have muffled we couldn't have muffled you couldn't have muffled they couldn't have muffled	I couldn't have been muffling you couldn't have been muffling he couldn't have been muffling we couldn't have been muffling you couldn't have been muffling they couldn't have been muffling

Interrogative form

Simple form	V-ing form
could I muffle? could you muffle? could he muffle? could we muffle? could you muffle? could they muffle?	could I be muffling? could you be muffling? could he be muffling? could we be muffling? could you be muffling? could they be muffling?
Perfect	V-ing perfect
could I have muffled? could you have muffled? could he have muffled? could we have muffled? could you have muffled? could they have muffled?	could I have been muffling? could you have been muffling? could he have been muffling? could we have been muffling? could you have been muffling? could they have been muffling?

Interro-negative form

Simple form	V-ing form
couldn't I muffle? couldn't you muffle? couldn't he muffle? couldn't we muffle? couldn't you muffle? couldn't they muffle?	couldn't I be muffling? couldn't you be muffling? couldn't he be muffling? couldn't we be muffling? couldn't you be muffling? couldn't they be muffling?
Perfect	V-ing perfect
couldn't I have muffled? couldn't you have muffled? couldn't he have muffled? couldn't we have muffled? couldn't you have muffled? couldn't they have muffled?	couldn't I have been muffling? couldn't you have been muffling? couldn't he have been muffling? couldn't we have been muffling? couldn't you have been muffling? couldn't they have been muffling?