English verb conjugation
COULD GLASS

Regular verb: glass - glassed - glassed

Affirmation

Simple form	V-ing form
I could glass you could glass he could glass we could glass you could glass they could glass	I could be glassing you could be glassing he could be glassing we could be glassing you could be glassing they could be glassing
Perfect	V-ing perfect
I could have glassed you could have glassed he could have glassed we could have glassed you could have glassed they could have glassed	I could have been glassing you could have been glassing he could have been glassing we could have been glassing you could have been glassing they could have been glassing

Negation

Simple form	V-ing form
I couldn't glass you couldn't glass he couldn't glass we couldn't glass you couldn't glass they couldn't glass	I couldn't be glassing you couldn't be glassing he couldn't be glassing we couldn't be glassing you couldn't be glassing they couldn't be glassing
Perfect	V-ing perfect
I couldn't have glassed you couldn't have glassed he couldn't have glassed we couldn't have glassed you couldn't have glassed they couldn't have glassed	I couldn't have been glassing you couldn't have been glassing he couldn't have been glassing we couldn't have been glassing you couldn't have been glassing they couldn't have been glassing

Interrogative form

Simple form	V-ing form
could I glass? could you glass? could he glass? could we glass? could you glass? could they glass?	could I be glassing? could you be glassing? could he be glassing? could we be glassing? could you be glassing? could they be glassing?
Perfect	V-ing perfect
could I have glassed? could you have glassed? could he have glassed? could we have glassed? could you have glassed? could they have glassed?	could I have been glassing? could you have been glassing? could he have been glassing? could we have been glassing? could you have been glassing? could they have been glassing?

Interro-negative form

Simple form	V-ing form
couldn't I glass? couldn't you glass? couldn't he glass? couldn't we glass? couldn't you glass? couldn't they glass?	couldn't I be glassing? couldn't you be glassing? couldn't he be glassing? couldn't we be glassing? couldn't you be glassing? couldn't they be glassing?
Perfect	V-ing perfect
couldn't I have glassed? couldn't you have glassed? couldn't he have glassed? couldn't we have glassed? couldn't you have glassed? couldn't they have glassed?	couldn't I have been glassing? couldn't you have been glassing? couldn't he have been glassing? couldn't we have been glassing? couldn't you have been glassing? couldn't they have been glassing?