English verb conjugation
COULD SINTER

Regular verb: sinter - sintered - sintered

Affirmation

Simple form	V-ing form
I could sinter you could sinter she could sinter we could sinter you could sinter they could sinter	I could be sintering you could be sintering she could be sintering we could be sintering you could be sintering they could be sintering
Perfect	V-ing perfect
I could have sintered you could have sintered she could have sintered we could have sintered you could have sintered they could have sintered	I could have been sintering you could have been sintering she could have been sintering we could have been sintering you could have been sintering they could have been sintering

Negation

Simple form	V-ing form
I couldn't sinter you couldn't sinter she couldn't sinter we couldn't sinter you couldn't sinter they couldn't sinter	I couldn't be sintering you couldn't be sintering she couldn't be sintering we couldn't be sintering you couldn't be sintering they couldn't be sintering
Perfect	V-ing perfect
I couldn't have sintered you couldn't have sintered she couldn't have sintered we couldn't have sintered you couldn't have sintered they couldn't have sintered	I couldn't have been sintering you couldn't have been sintering she couldn't have been sintering we couldn't have been sintering you couldn't have been sintering they couldn't have been sintering

Interrogative form

Simple form	V-ing form
could I sinter? could you sinter? could she sinter? could we sinter? could you sinter? could they sinter?	could I be sintering? could you be sintering? could she be sintering? could we be sintering? could you be sintering? could they be sintering?
Perfect	V-ing perfect
could I have sintered? could you have sintered? could she have sintered? could we have sintered? could you have sintered? could they have sintered?	could I have been sintering? could you have been sintering? could she have been sintering? could we have been sintering? could you have been sintering? could they have been sintering?

Interro-negative form

Simple form	V-ing form
couldn't I sinter? couldn't you sinter? couldn't she sinter? couldn't we sinter? couldn't you sinter? couldn't they sinter?	couldn't I be sintering? couldn't you be sintering? couldn't she be sintering? couldn't we be sintering? couldn't you be sintering? couldn't they be sintering?
Perfect	V-ing perfect
couldn't I have sintered? couldn't you have sintered? couldn't she have sintered? couldn't we have sintered? couldn't you have sintered? couldn't they have sintered?	couldn't I have been sintering? couldn't you have been sintering? couldn't she have been sintering? couldn't we have been sintering? couldn't you have been sintering? couldn't they have been sintering?