English verb conjugation
COULD ASSEMBLE

Regular verb: assemble - assembled - assembled

Affirmation

Simple form	V-ing form
I could assemble you could assemble he could assemble we could assemble you could assemble they could assemble	I could be assembling you could be assembling he could be assembling we could be assembling you could be assembling they could be assembling
Perfect	V-ing perfect
I could have assembled you could have assembled he could have assembled we could have assembled you could have assembled they could have assembled	I could have been assembling you could have been assembling he could have been assembling we could have been assembling you could have been assembling they could have been assembling

Negation

Simple form	V-ing form
I couldn't assemble you couldn't assemble he couldn't assemble we couldn't assemble you couldn't assemble they couldn't assemble	I couldn't be assembling you couldn't be assembling he couldn't be assembling we couldn't be assembling you couldn't be assembling they couldn't be assembling
Perfect	V-ing perfect
I couldn't have assembled you couldn't have assembled he couldn't have assembled we couldn't have assembled you couldn't have assembled they couldn't have assembled	I couldn't have been assembling you couldn't have been assembling he couldn't have been assembling we couldn't have been assembling you couldn't have been assembling they couldn't have been assembling

Interrogative form

Simple form	V-ing form
could I assemble? could you assemble? could he assemble? could we assemble? could you assemble? could they assemble?	could I be assembling? could you be assembling? could he be assembling? could we be assembling? could you be assembling? could they be assembling?
Perfect	V-ing perfect
could I have assembled? could you have assembled? could he have assembled? could we have assembled? could you have assembled? could they have assembled?	could I have been assembling? could you have been assembling? could he have been assembling? could we have been assembling? could you have been assembling? could they have been assembling?

Interro-negative form

Simple form	V-ing form
couldn't I assemble? couldn't you assemble? couldn't he assemble? couldn't we assemble? couldn't you assemble? couldn't they assemble?	couldn't I be assembling? couldn't you be assembling? couldn't he be assembling? couldn't we be assembling? couldn't you be assembling? couldn't they be assembling?
Perfect	V-ing perfect
couldn't I have assembled? couldn't you have assembled? couldn't he have assembled? couldn't we have assembled? couldn't you have assembled? couldn't they have assembled?	couldn't I have been assembling? couldn't you have been assembling? couldn't he have been assembling? couldn't we have been assembling? couldn't you have been assembling? couldn't they have been assembling?