English verb conjugation
COULD GLOW

Regular verb: glow - glowed - glowed

Affirmation

Simple form	V-ing form
I could glow you could glow he could glow we could glow you could glow they could glow	I could be glowing you could be glowing he could be glowing we could be glowing you could be glowing they could be glowing
Perfect	V-ing perfect
I could have glowed you could have glowed he could have glowed we could have glowed you could have glowed they could have glowed	I could have been glowing you could have been glowing he could have been glowing we could have been glowing you could have been glowing they could have been glowing

Negation

Simple form	V-ing form
I couldn't glow you couldn't glow he couldn't glow we couldn't glow you couldn't glow they couldn't glow	I couldn't be glowing you couldn't be glowing he couldn't be glowing we couldn't be glowing you couldn't be glowing they couldn't be glowing
Perfect	V-ing perfect
I couldn't have glowed you couldn't have glowed he couldn't have glowed we couldn't have glowed you couldn't have glowed they couldn't have glowed	I couldn't have been glowing you couldn't have been glowing he couldn't have been glowing we couldn't have been glowing you couldn't have been glowing they couldn't have been glowing

Interrogative form

Simple form	V-ing form
could I glow? could you glow? could he glow? could we glow? could you glow? could they glow?	could I be glowing? could you be glowing? could he be glowing? could we be glowing? could you be glowing? could they be glowing?
Perfect	V-ing perfect
could I have glowed? could you have glowed? could he have glowed? could we have glowed? could you have glowed? could they have glowed?	could I have been glowing? could you have been glowing? could he have been glowing? could we have been glowing? could you have been glowing? could they have been glowing?

Interro-negative form

Simple form	V-ing form
couldn't I glow? couldn't you glow? couldn't he glow? couldn't we glow? couldn't you glow? couldn't they glow?	couldn't I be glowing? couldn't you be glowing? couldn't he be glowing? couldn't we be glowing? couldn't you be glowing? couldn't they be glowing?
Perfect	V-ing perfect
couldn't I have glowed? couldn't you have glowed? couldn't he have glowed? couldn't we have glowed? couldn't you have glowed? couldn't they have glowed?	couldn't I have been glowing? couldn't you have been glowing? couldn't he have been glowing? couldn't we have been glowing? couldn't you have been glowing? couldn't they have been glowing?