English verb conjugation
COULD SNIFFLE

Regular verb: sniffle - sniffled - sniffled

Affirmation

Simple form	V-ing form
I could sniffle you could sniffle he could sniffle we could sniffle you could sniffle they could sniffle	I could be sniffling you could be sniffling he could be sniffling we could be sniffling you could be sniffling they could be sniffling
Perfect	V-ing perfect
I could have sniffled you could have sniffled he could have sniffled we could have sniffled you could have sniffled they could have sniffled	I could have been sniffling you could have been sniffling he could have been sniffling we could have been sniffling you could have been sniffling they could have been sniffling

Negation

Simple form	V-ing form
I couldn't sniffle you couldn't sniffle he couldn't sniffle we couldn't sniffle you couldn't sniffle they couldn't sniffle	I couldn't be sniffling you couldn't be sniffling he couldn't be sniffling we couldn't be sniffling you couldn't be sniffling they couldn't be sniffling
Perfect	V-ing perfect
I couldn't have sniffled you couldn't have sniffled he couldn't have sniffled we couldn't have sniffled you couldn't have sniffled they couldn't have sniffled	I couldn't have been sniffling you couldn't have been sniffling he couldn't have been sniffling we couldn't have been sniffling you couldn't have been sniffling they couldn't have been sniffling

Interrogative form

Simple form	V-ing form
could I sniffle? could you sniffle? could he sniffle? could we sniffle? could you sniffle? could they sniffle?	could I be sniffling? could you be sniffling? could he be sniffling? could we be sniffling? could you be sniffling? could they be sniffling?
Perfect	V-ing perfect
could I have sniffled? could you have sniffled? could he have sniffled? could we have sniffled? could you have sniffled? could they have sniffled?	could I have been sniffling? could you have been sniffling? could he have been sniffling? could we have been sniffling? could you have been sniffling? could they have been sniffling?

Interro-negative form

Simple form	V-ing form
couldn't I sniffle? couldn't you sniffle? couldn't he sniffle? couldn't we sniffle? couldn't you sniffle? couldn't they sniffle?	couldn't I be sniffling? couldn't you be sniffling? couldn't he be sniffling? couldn't we be sniffling? couldn't you be sniffling? couldn't they be sniffling?
Perfect	V-ing perfect
couldn't I have sniffled? couldn't you have sniffled? couldn't he have sniffled? couldn't we have sniffled? couldn't you have sniffled? couldn't they have sniffled?	couldn't I have been sniffling? couldn't you have been sniffling? couldn't he have been sniffling? couldn't we have been sniffling? couldn't you have been sniffling? couldn't they have been sniffling?