English verb conjugation
COULD PLAGIARISE

Regular verb: plagiarise - plagiarised - plagiarised

Affirmation

Simple form	V-ing form
I could plagiarise you could plagiarise he could plagiarise we could plagiarise you could plagiarise they could plagiarise	I could be plagiarising you could be plagiarising he could be plagiarising we could be plagiarising you could be plagiarising they could be plagiarising
Perfect	V-ing perfect
I could have plagiarised you could have plagiarised he could have plagiarised we could have plagiarised you could have plagiarised they could have plagiarised	I could have been plagiarising you could have been plagiarising he could have been plagiarising we could have been plagiarising you could have been plagiarising they could have been plagiarising

Negation

Simple form	V-ing form
I couldn't plagiarise you couldn't plagiarise he couldn't plagiarise we couldn't plagiarise you couldn't plagiarise they couldn't plagiarise	I couldn't be plagiarising you couldn't be plagiarising he couldn't be plagiarising we couldn't be plagiarising you couldn't be plagiarising they couldn't be plagiarising
Perfect	V-ing perfect
I couldn't have plagiarised you couldn't have plagiarised he couldn't have plagiarised we couldn't have plagiarised you couldn't have plagiarised they couldn't have plagiarised	I couldn't have been plagiarising you couldn't have been plagiarising he couldn't have been plagiarising we couldn't have been plagiarising you couldn't have been plagiarising they couldn't have been plagiarising

Interrogative form

Simple form	V-ing form
could I plagiarise? could you plagiarise? could he plagiarise? could we plagiarise? could you plagiarise? could they plagiarise?	could I be plagiarising? could you be plagiarising? could he be plagiarising? could we be plagiarising? could you be plagiarising? could they be plagiarising?
Perfect	V-ing perfect
could I have plagiarised? could you have plagiarised? could he have plagiarised? could we have plagiarised? could you have plagiarised? could they have plagiarised?	could I have been plagiarising? could you have been plagiarising? could he have been plagiarising? could we have been plagiarising? could you have been plagiarising? could they have been plagiarising?

Interro-negative form

Simple form	V-ing form
couldn't I plagiarise? couldn't you plagiarise? couldn't he plagiarise? couldn't we plagiarise? couldn't you plagiarise? couldn't they plagiarise?	couldn't I be plagiarising? couldn't you be plagiarising? couldn't he be plagiarising? couldn't we be plagiarising? couldn't you be plagiarising? couldn't they be plagiarising?
Perfect	V-ing perfect
couldn't I have plagiarised? couldn't you have plagiarised? couldn't he have plagiarised? couldn't we have plagiarised? couldn't you have plagiarised? couldn't they have plagiarised?	couldn't I have been plagiarising? couldn't you have been plagiarising? couldn't he have been plagiarising? couldn't we have been plagiarising? couldn't you have been plagiarising? couldn't they have been plagiarising?