English verb conjugation
COULD SERRATE

Regular verb: serrate - serrated - serrated

Affirmation

Simple form	V-ing form
I could serrate you could serrate he could serrate we could serrate you could serrate they could serrate	I could be serrating you could be serrating he could be serrating we could be serrating you could be serrating they could be serrating
Perfect	V-ing perfect
I could have serrated you could have serrated he could have serrated we could have serrated you could have serrated they could have serrated	I could have been serrating you could have been serrating he could have been serrating we could have been serrating you could have been serrating they could have been serrating

Negation

Simple form	V-ing form
I could not serrate you could not serrate he could not serrate we could not serrate you could not serrate they could not serrate	I could not be serrating you could not be serrating he could not be serrating we could not be serrating you could not be serrating they could not be serrating
Perfect	V-ing perfect
I could not have serrated you could not have serrated he could not have serrated we could not have serrated you could not have serrated they could not have serrated	I could not have been serrating you could not have been serrating he could not have been serrating we could not have been serrating you could not have been serrating they could not have been serrating

Interrogative form

Simple form	V-ing form
could I serrate? could you serrate? could he serrate? could we serrate? could you serrate? could they serrate?	could I be serrating? could you be serrating? could he be serrating? could we be serrating? could you be serrating? could they be serrating?
Perfect	V-ing perfect
could I have serrated? could you have serrated? could he have serrated? could we have serrated? could you have serrated? could they have serrated?	could I have been serrating? could you have been serrating? could he have been serrating? could we have been serrating? could you have been serrating? could they have been serrating?

Interro-negative form

Simple form	V-ing form
could I not serrate? could you not serrate? could he not serrate? could we not serrate? could you not serrate? could they not serrate?	could I not be serrating? could you not be serrating? could he not be serrating? could we not be serrating? could you not be serrating? could they not be serrating?
Perfect	V-ing perfect
could I not have serrated? could you not have serrated? could he not have serrated? could we not have serrated? could you not have serrated? could they not have serrated?	could I not have been serrating? could you not have been serrating? could he not have been serrating? could we not have been serrating? could you not have been serrating? could they not have been serrating?