English verb conjugation
COULD CONCATENATE

Regular verb: concatenate - concatenated - concatenated

Affirmation

Simple form	V-ing form
I could concatenate you could concatenate he could concatenate we could concatenate you could concatenate they could concatenate	I could be concatenating you could be concatenating he could be concatenating we could be concatenating you could be concatenating they could be concatenating
Perfect	V-ing perfect
I could have concatenated you could have concatenated he could have concatenated we could have concatenated you could have concatenated they could have concatenated	I could have been concatenating you could have been concatenating he could have been concatenating we could have been concatenating you could have been concatenating they could have been concatenating

Negation

Simple form	V-ing form
I couldn't concatenate you couldn't concatenate he couldn't concatenate we couldn't concatenate you couldn't concatenate they couldn't concatenate	I couldn't be concatenating you couldn't be concatenating he couldn't be concatenating we couldn't be concatenating you couldn't be concatenating they couldn't be concatenating
Perfect	V-ing perfect
I couldn't have concatenated you couldn't have concatenated he couldn't have concatenated we couldn't have concatenated you couldn't have concatenated they couldn't have concatenated	I couldn't have been concatenating you couldn't have been concatenating he couldn't have been concatenating we couldn't have been concatenating you couldn't have been concatenating they couldn't have been concatenating

Interrogative form

Simple form	V-ing form
could I concatenate? could you concatenate? could he concatenate? could we concatenate? could you concatenate? could they concatenate?	could I be concatenating? could you be concatenating? could he be concatenating? could we be concatenating? could you be concatenating? could they be concatenating?
Perfect	V-ing perfect
could I have concatenated? could you have concatenated? could he have concatenated? could we have concatenated? could you have concatenated? could they have concatenated?	could I have been concatenating? could you have been concatenating? could he have been concatenating? could we have been concatenating? could you have been concatenating? could they have been concatenating?

Interro-negative form

Simple form	V-ing form
couldn't I concatenate? couldn't you concatenate? couldn't he concatenate? couldn't we concatenate? couldn't you concatenate? couldn't they concatenate?	couldn't I be concatenating? couldn't you be concatenating? couldn't he be concatenating? couldn't we be concatenating? couldn't you be concatenating? couldn't they be concatenating?
Perfect	V-ing perfect
couldn't I have concatenated? couldn't you have concatenated? couldn't he have concatenated? couldn't we have concatenated? couldn't you have concatenated? couldn't they have concatenated?	couldn't I have been concatenating? couldn't you have been concatenating? couldn't he have been concatenating? couldn't we have been concatenating? couldn't you have been concatenating? couldn't they have been concatenating?