English verb conjugation
COULD PREMIX

Regular verb: premix - premixed - premixed

Affirmation

Simple form	V-ing form
I could premix you could premix he could premix we could premix you could premix they could premix	I could be premixing you could be premixing he could be premixing we could be premixing you could be premixing they could be premixing
Perfect	V-ing perfect
I could have premixed you could have premixed he could have premixed we could have premixed you could have premixed they could have premixed	I could have been premixing you could have been premixing he could have been premixing we could have been premixing you could have been premixing they could have been premixing

Negation

Simple form	V-ing form
I couldn't premix you couldn't premix he couldn't premix we couldn't premix you couldn't premix they couldn't premix	I couldn't be premixing you couldn't be premixing he couldn't be premixing we couldn't be premixing you couldn't be premixing they couldn't be premixing
Perfect	V-ing perfect
I couldn't have premixed you couldn't have premixed he couldn't have premixed we couldn't have premixed you couldn't have premixed they couldn't have premixed	I couldn't have been premixing you couldn't have been premixing he couldn't have been premixing we couldn't have been premixing you couldn't have been premixing they couldn't have been premixing

Interrogative form

Simple form	V-ing form
could I premix? could you premix? could he premix? could we premix? could you premix? could they premix?	could I be premixing? could you be premixing? could he be premixing? could we be premixing? could you be premixing? could they be premixing?
Perfect	V-ing perfect
could I have premixed? could you have premixed? could he have premixed? could we have premixed? could you have premixed? could they have premixed?	could I have been premixing? could you have been premixing? could he have been premixing? could we have been premixing? could you have been premixing? could they have been premixing?

Interro-negative form

Simple form	V-ing form
couldn't I premix? couldn't you premix? couldn't he premix? couldn't we premix? couldn't you premix? couldn't they premix?	couldn't I be premixing? couldn't you be premixing? couldn't he be premixing? couldn't we be premixing? couldn't you be premixing? couldn't they be premixing?
Perfect	V-ing perfect
couldn't I have premixed? couldn't you have premixed? couldn't he have premixed? couldn't we have premixed? couldn't you have premixed? couldn't they have premixed?	couldn't I have been premixing? couldn't you have been premixing? couldn't he have been premixing? couldn't we have been premixing? couldn't you have been premixing? couldn't they have been premixing?