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 couldn't serrate you couldn't serrate he couldn't serrate we couldn't serrate you couldn't serrate they couldn't serrate	I couldn't be serrating you couldn't be serrating he couldn't be serrating we couldn't be serrating you couldn't be serrating they couldn't be serrating
Perfect	V-ing perfect
I couldn't have serrated you couldn't have serrated he couldn't have serrated we couldn't have serrated you couldn't have serrated they couldn't have serrated	I couldn't have been serrating you couldn't have been serrating he couldn't have been serrating we couldn't have been serrating you couldn't have been serrating they couldn't 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
couldn't I serrate? couldn't you serrate? couldn't he serrate? couldn't we serrate? couldn't you serrate? couldn't they serrate?	couldn't I be serrating? couldn't you be serrating? couldn't he be serrating? couldn't we be serrating? couldn't you be serrating? couldn't they be serrating?
Perfect	V-ing perfect
couldn't I have serrated? couldn't you have serrated? couldn't he have serrated? couldn't we have serrated? couldn't you have serrated? couldn't they have serrated?	couldn't I have been serrating? couldn't you have been serrating? couldn't he have been serrating? couldn't we have been serrating? couldn't you have been serrating? couldn't they have been serrating?