English verb conjugation
COULD SERIALIZE

Regular verb: serialize - serialized - serialized

Affirmation

Simple form	V-ing form
I could serialize you could serialize he could serialize we could serialize you could serialize they could serialize	I could be serializing you could be serializing he could be serializing we could be serializing you could be serializing they could be serializing
Perfect	V-ing perfect
I could have serialized you could have serialized he could have serialized we could have serialized you could have serialized they could have serialized	I could have been serializing you could have been serializing he could have been serializing we could have been serializing you could have been serializing they could have been serializing

Negation

Simple form	V-ing form
I couldn't serialize you couldn't serialize he couldn't serialize we couldn't serialize you couldn't serialize they couldn't serialize	I couldn't be serializing you couldn't be serializing he couldn't be serializing we couldn't be serializing you couldn't be serializing they couldn't be serializing
Perfect	V-ing perfect
I couldn't have serialized you couldn't have serialized he couldn't have serialized we couldn't have serialized you couldn't have serialized they couldn't have serialized	I couldn't have been serializing you couldn't have been serializing he couldn't have been serializing we couldn't have been serializing you couldn't have been serializing they couldn't have been serializing

Interrogative form

Simple form	V-ing form
could I serialize? could you serialize? could he serialize? could we serialize? could you serialize? could they serialize?	could I be serializing? could you be serializing? could he be serializing? could we be serializing? could you be serializing? could they be serializing?
Perfect	V-ing perfect
could I have serialized? could you have serialized? could he have serialized? could we have serialized? could you have serialized? could they have serialized?	could I have been serializing? could you have been serializing? could he have been serializing? could we have been serializing? could you have been serializing? could they have been serializing?

Interro-negative form

Simple form	V-ing form
couldn't I serialize? couldn't you serialize? couldn't he serialize? couldn't we serialize? couldn't you serialize? couldn't they serialize?	couldn't I be serializing? couldn't you be serializing? couldn't he be serializing? couldn't we be serializing? couldn't you be serializing? couldn't they be serializing?
Perfect	V-ing perfect
couldn't I have serialized? couldn't you have serialized? couldn't he have serialized? couldn't we have serialized? couldn't you have serialized? couldn't they have serialized?	couldn't I have been serializing? couldn't you have been serializing? couldn't he have been serializing? couldn't we have been serializing? couldn't you have been serializing? couldn't they have been serializing?