English verb conjugation
COULD ULULATE

Regular verb: ululate - ululated - ululated

Affirmation

Simple form	V-ing form
I could ululate you could ululate he could ululate we could ululate you could ululate they could ululate	I could be ululating you could be ululating he could be ululating we could be ululating you could be ululating they could be ululating
Perfect	V-ing perfect
I could have ululated you could have ululated he could have ululated we could have ululated you could have ululated they could have ululated	I could have been ululating you could have been ululating he could have been ululating we could have been ululating you could have been ululating they could have been ululating

Negation

Simple form	V-ing form
I could not ululate you could not ululate he could not ululate we could not ululate you could not ululate they could not ululate	I could not be ululating you could not be ululating he could not be ululating we could not be ululating you could not be ululating they could not be ululating
Perfect	V-ing perfect
I could not have ululated you could not have ululated he could not have ululated we could not have ululated you could not have ululated they could not have ululated	I could not have been ululating you could not have been ululating he could not have been ululating we could not have been ululating you could not have been ululating they could not have been ululating

Interrogative form

Simple form	V-ing form
could I ululate? could you ululate? could he ululate? could we ululate? could you ululate? could they ululate?	could I be ululating? could you be ululating? could he be ululating? could we be ululating? could you be ululating? could they be ululating?
Perfect	V-ing perfect
could I have ululated? could you have ululated? could he have ululated? could we have ululated? could you have ululated? could they have ululated?	could I have been ululating? could you have been ululating? could he have been ululating? could we have been ululating? could you have been ululating? could they have been ululating?

Interro-negative form

Simple form	V-ing form
could I not ululate? could you not ululate? could he not ululate? could we not ululate? could you not ululate? could they not ululate?	could I not be ululating? could you not be ululating? could he not be ululating? could we not be ululating? could you not be ululating? could they not be ululating?
Perfect	V-ing perfect
could I not have ululated? could you not have ululated? could he not have ululated? could we not have ululated? could you not have ululated? could they not have ululated?	could I not have been ululating? could you not have been ululating? could he not have been ululating? could we not have been ululating? could you not have been ululating? could they not have been ululating?