I could carboxylate you could carboxylate he could carboxylate we could carboxylate you could carboxylate they could carboxylate
V-ing form
I could be carboxylating you could be carboxylating he could be carboxylating we could be carboxylating you could be carboxylating they could be carboxylating
Perfect
I could have carboxylated you could have carboxylated he could have carboxylated we could have carboxylated you could have carboxylated they could have carboxylated
V-ing perfect
I could have been carboxylating you could have been carboxylating he could have been carboxylating we could have been carboxylating you could have been carboxylating they could have been carboxylating
Negation
Simple form
I couldn't carboxylate you couldn't carboxylate he couldn't carboxylate we couldn't carboxylate you couldn't carboxylate they couldn't carboxylate
V-ing form
I couldn't be carboxylating you couldn't be carboxylating he couldn't be carboxylating we couldn't be carboxylating you couldn't be carboxylating they couldn't be carboxylating
Perfect
I couldn't have carboxylated you couldn't have carboxylated he couldn't have carboxylated we couldn't have carboxylated you couldn't have carboxylated they couldn't have carboxylated
V-ing perfect
I couldn't have been carboxylating you couldn't have been carboxylating he couldn't have been carboxylating we couldn't have been carboxylating you couldn't have been carboxylating they couldn't have been carboxylating
Interrogative form
Simple form
could I carboxylate? could you carboxylate? could he carboxylate? could we carboxylate? could you carboxylate? could they carboxylate?
V-ing form
could I be carboxylating? could you be carboxylating? could he be carboxylating? could we be carboxylating? could you be carboxylating? could they be carboxylating?
Perfect
could I have carboxylated? could you have carboxylated? could he have carboxylated? could we have carboxylated? could you have carboxylated? could they have carboxylated?
V-ing perfect
could I have been carboxylating? could you have been carboxylating? could he have been carboxylating? could we have been carboxylating? could you have been carboxylating? could they have been carboxylating?
Interro-negative form
Simple form
couldn't I carboxylate? couldn't you carboxylate? couldn't he carboxylate? couldn't we carboxylate? couldn't you carboxylate? couldn't they carboxylate?
V-ing form
couldn't I be carboxylating? couldn't you be carboxylating? couldn't he be carboxylating? couldn't we be carboxylating? couldn't you be carboxylating? couldn't they be carboxylating?
Perfect
couldn't I have carboxylated? couldn't you have carboxylated? couldn't he have carboxylated? couldn't we have carboxylated? couldn't you have carboxylated? couldn't they have carboxylated?
V-ing perfect
couldn't I have been carboxylating? couldn't you have been carboxylating? couldn't he have been carboxylating? couldn't we have been carboxylating? couldn't you have been carboxylating? couldn't they have been carboxylating?