English verb conjugation
COULD PREINSERT

Regular verb: preinsert - preinserted - preinserted

Affirmation

Simple form	V-ing form
I could preinsert you could preinsert he could preinsert we could preinsert you could preinsert they could preinsert	I could be preinserting you could be preinserting he could be preinserting we could be preinserting you could be preinserting they could be preinserting
Perfect	V-ing perfect
I could have preinserted you could have preinserted he could have preinserted we could have preinserted you could have preinserted they could have preinserted	I could have been preinserting you could have been preinserting he could have been preinserting we could have been preinserting you could have been preinserting they could have been preinserting

Negation

Simple form	V-ing form
I couldn't preinsert you couldn't preinsert he couldn't preinsert we couldn't preinsert you couldn't preinsert they couldn't preinsert	I couldn't be preinserting you couldn't be preinserting he couldn't be preinserting we couldn't be preinserting you couldn't be preinserting they couldn't be preinserting
Perfect	V-ing perfect
I couldn't have preinserted you couldn't have preinserted he couldn't have preinserted we couldn't have preinserted you couldn't have preinserted they couldn't have preinserted	I couldn't have been preinserting you couldn't have been preinserting he couldn't have been preinserting we couldn't have been preinserting you couldn't have been preinserting they couldn't have been preinserting

Interrogative form

Simple form	V-ing form
could I preinsert? could you preinsert? could he preinsert? could we preinsert? could you preinsert? could they preinsert?	could I be preinserting? could you be preinserting? could he be preinserting? could we be preinserting? could you be preinserting? could they be preinserting?
Perfect	V-ing perfect
could I have preinserted? could you have preinserted? could he have preinserted? could we have preinserted? could you have preinserted? could they have preinserted?	could I have been preinserting? could you have been preinserting? could he have been preinserting? could we have been preinserting? could you have been preinserting? could they have been preinserting?

Interro-negative form

Simple form	V-ing form
couldn't I preinsert? couldn't you preinsert? couldn't he preinsert? couldn't we preinsert? couldn't you preinsert? couldn't they preinsert?	couldn't I be preinserting? couldn't you be preinserting? couldn't he be preinserting? couldn't we be preinserting? couldn't you be preinserting? couldn't they be preinserting?
Perfect	V-ing perfect
couldn't I have preinserted? couldn't you have preinserted? couldn't he have preinserted? couldn't we have preinserted? couldn't you have preinserted? couldn't they have preinserted?	couldn't I have been preinserting? couldn't you have been preinserting? couldn't he have been preinserting? couldn't we have been preinserting? couldn't you have been preinserting? couldn't they have been preinserting?