English verb conjugation
COULD MURMUR

Regular verb: murmur - murmured - murmured

Affirmation

Simple form	V-ing form
I could murmur you could murmur he could murmur we could murmur you could murmur they could murmur	I could be murmuring you could be murmuring he could be murmuring we could be murmuring you could be murmuring they could be murmuring
Perfect	V-ing perfect
I could have murmured you could have murmured he could have murmured we could have murmured you could have murmured they could have murmured	I could have been murmuring you could have been murmuring he could have been murmuring we could have been murmuring you could have been murmuring they could have been murmuring

Negation

Simple form	V-ing form
I couldn't murmur you couldn't murmur he couldn't murmur we couldn't murmur you couldn't murmur they couldn't murmur	I couldn't be murmuring you couldn't be murmuring he couldn't be murmuring we couldn't be murmuring you couldn't be murmuring they couldn't be murmuring
Perfect	V-ing perfect
I couldn't have murmured you couldn't have murmured he couldn't have murmured we couldn't have murmured you couldn't have murmured they couldn't have murmured	I couldn't have been murmuring you couldn't have been murmuring he couldn't have been murmuring we couldn't have been murmuring you couldn't have been murmuring they couldn't have been murmuring

Interrogative form

Simple form	V-ing form
could I murmur? could you murmur? could he murmur? could we murmur? could you murmur? could they murmur?	could I be murmuring? could you be murmuring? could he be murmuring? could we be murmuring? could you be murmuring? could they be murmuring?
Perfect	V-ing perfect
could I have murmured? could you have murmured? could he have murmured? could we have murmured? could you have murmured? could they have murmured?	could I have been murmuring? could you have been murmuring? could he have been murmuring? could we have been murmuring? could you have been murmuring? could they have been murmuring?

Interro-negative form

Simple form	V-ing form
couldn't I murmur? couldn't you murmur? couldn't he murmur? couldn't we murmur? couldn't you murmur? couldn't they murmur?	couldn't I be murmuring? couldn't you be murmuring? couldn't he be murmuring? couldn't we be murmuring? couldn't you be murmuring? couldn't they be murmuring?
Perfect	V-ing perfect
couldn't I have murmured? couldn't you have murmured? couldn't he have murmured? couldn't we have murmured? couldn't you have murmured? couldn't they have murmured?	couldn't I have been murmuring? couldn't you have been murmuring? couldn't he have been murmuring? couldn't we have been murmuring? couldn't you have been murmuring? couldn't they have been murmuring?