English verb conjugation
COULD SERVICE

Regular verb: service - serviced - serviced

Affirmation

Simple form	V-ing form
I could service you could service he could service we could service you could service they could service	I could be servicing you could be servicing he could be servicing we could be servicing you could be servicing they could be servicing
Perfect	V-ing perfect
I could have serviced you could have serviced he could have serviced we could have serviced you could have serviced they could have serviced	I could have been servicing you could have been servicing he could have been servicing we could have been servicing you could have been servicing they could have been servicing

Negation

Simple form	V-ing form
I could not service you could not service he could not service we could not service you could not service they could not service	I could not be servicing you could not be servicing he could not be servicing we could not be servicing you could not be servicing they could not be servicing
Perfect	V-ing perfect
I could not have serviced you could not have serviced he could not have serviced we could not have serviced you could not have serviced they could not have serviced	I could not have been servicing you could not have been servicing he could not have been servicing we could not have been servicing you could not have been servicing they could not have been servicing

Interrogative form

Simple form	V-ing form
could I service? could you service? could he service? could we service? could you service? could they service?	could I be servicing? could you be servicing? could he be servicing? could we be servicing? could you be servicing? could they be servicing?
Perfect	V-ing perfect
could I have serviced? could you have serviced? could he have serviced? could we have serviced? could you have serviced? could they have serviced?	could I have been servicing? could you have been servicing? could he have been servicing? could we have been servicing? could you have been servicing? could they have been servicing?

Interro-negative form

Simple form	V-ing form
could I not service? could you not service? could he not service? could we not service? could you not service? could they not service?	could I not be servicing? could you not be servicing? could he not be servicing? could we not be servicing? could you not be servicing? could they not be servicing?
Perfect	V-ing perfect
could I not have serviced? could you not have serviced? could he not have serviced? could we not have serviced? could you not have serviced? could they not have serviced?	could I not have been servicing? could you not have been servicing? could he not have been servicing? could we not have been servicing? could you not have been servicing? could they not have been servicing?