English verb conjugation
COULD SYSTEMATISE

Regular verb: systematise - systematised - systematised

Affirmation

Simple form	V-ing form
I could systematise you could systematise he could systematise we could systematise you could systematise they could systematise	I could be systematising you could be systematising he could be systematising we could be systematising you could be systematising they could be systematising
Perfect	V-ing perfect
I could have systematised you could have systematised he could have systematised we could have systematised you could have systematised they could have systematised	I could have been systematising you could have been systematising he could have been systematising we could have been systematising you could have been systematising they could have been systematising

Negation

Simple form	V-ing form
I couldn't systematise you couldn't systematise he couldn't systematise we couldn't systematise you couldn't systematise they couldn't systematise	I couldn't be systematising you couldn't be systematising he couldn't be systematising we couldn't be systematising you couldn't be systematising they couldn't be systematising
Perfect	V-ing perfect
I couldn't have systematised you couldn't have systematised he couldn't have systematised we couldn't have systematised you couldn't have systematised they couldn't have systematised	I couldn't have been systematising you couldn't have been systematising he couldn't have been systematising we couldn't have been systematising you couldn't have been systematising they couldn't have been systematising

Interrogative form

Simple form	V-ing form
could I systematise? could you systematise? could he systematise? could we systematise? could you systematise? could they systematise?	could I be systematising? could you be systematising? could he be systematising? could we be systematising? could you be systematising? could they be systematising?
Perfect	V-ing perfect
could I have systematised? could you have systematised? could he have systematised? could we have systematised? could you have systematised? could they have systematised?	could I have been systematising? could you have been systematising? could he have been systematising? could we have been systematising? could you have been systematising? could they have been systematising?

Interro-negative form

Simple form	V-ing form
couldn't I systematise? couldn't you systematise? couldn't he systematise? couldn't we systematise? couldn't you systematise? couldn't they systematise?	couldn't I be systematising? couldn't you be systematising? couldn't he be systematising? couldn't we be systematising? couldn't you be systematising? couldn't they be systematising?
Perfect	V-ing perfect
couldn't I have systematised? couldn't you have systematised? couldn't he have systematised? couldn't we have systematised? couldn't you have systematised? couldn't they have systematised?	couldn't I have been systematising? couldn't you have been systematising? couldn't he have been systematising? couldn't we have been systematising? couldn't you have been systematising? couldn't they have been systematising?