English verb conjugation
MUST SNIFFLE

Regular verb: sniffle - sniffled - sniffled

Affirmation

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

Negation

Simple form	V-ing form
I must not sniffle you must not sniffle he must not sniffle we must not sniffle you must not sniffle they must not sniffle	I must not be sniffling you must not be sniffling he must not be sniffling we must not be sniffling you must not be sniffling they must not be sniffling
Perfect	V-ing perfect
I must not have sniffled you must not have sniffled he must not have sniffled we must not have sniffled you must not have sniffled they must not have sniffled	I must not have been sniffling you must not have been sniffling he must not have been sniffling we must not have been sniffling you must not have been sniffling they must not have been sniffling

Interrogative form

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

Interro-negative form

Simple form	V-ing form
must I not sniffle? must you not sniffle? must he not sniffle? must we not sniffle? must you not sniffle? must they not sniffle?	must I not be sniffling? must you not be sniffling? must he not be sniffling? must we not be sniffling? must you not be sniffling? must they not be sniffling?
Perfect	V-ing perfect
must I not have sniffled? must you not have sniffled? must he not have sniffled? must we not have sniffled? must you not have sniffled? must they not have sniffled?	must I not have been sniffling? must you not have been sniffling? must he not have been sniffling? must we not have been sniffling? must you not have been sniffling? must they not have been sniffling?