English verb conjugation
COULD SNEEZE

Regular verb: sneeze - sneezed - sneezed

Affirmation

Simple form	V-ing form
I could sneeze you could sneeze he could sneeze we could sneeze you could sneeze they could sneeze	I could be sneezing you could be sneezing he could be sneezing we could be sneezing you could be sneezing they could be sneezing
Perfect	V-ing perfect
I could have sneezed you could have sneezed he could have sneezed we could have sneezed you could have sneezed they could have sneezed	I could have been sneezing you could have been sneezing he could have been sneezing we could have been sneezing you could have been sneezing they could have been sneezing

Negation

Simple form	V-ing form
I could not sneeze you could not sneeze he could not sneeze we could not sneeze you could not sneeze they could not sneeze	I could not be sneezing you could not be sneezing he could not be sneezing we could not be sneezing you could not be sneezing they could not be sneezing
Perfect	V-ing perfect
I could not have sneezed you could not have sneezed he could not have sneezed we could not have sneezed you could not have sneezed they could not have sneezed	I could not have been sneezing you could not have been sneezing he could not have been sneezing we could not have been sneezing you could not have been sneezing they could not have been sneezing

Interrogative form

Simple form	V-ing form
could I sneeze? could you sneeze? could he sneeze? could we sneeze? could you sneeze? could they sneeze?	could I be sneezing? could you be sneezing? could he be sneezing? could we be sneezing? could you be sneezing? could they be sneezing?
Perfect	V-ing perfect
could I have sneezed? could you have sneezed? could he have sneezed? could we have sneezed? could you have sneezed? could they have sneezed?	could I have been sneezing? could you have been sneezing? could he have been sneezing? could we have been sneezing? could you have been sneezing? could they have been sneezing?

Interro-negative form

Simple form	V-ing form
could I not sneeze? could you not sneeze? could he not sneeze? could we not sneeze? could you not sneeze? could they not sneeze?	could I not be sneezing? could you not be sneezing? could he not be sneezing? could we not be sneezing? could you not be sneezing? could they not be sneezing?
Perfect	V-ing perfect
could I not have sneezed? could you not have sneezed? could he not have sneezed? could we not have sneezed? could you not have sneezed? could they not have sneezed?	could I not have been sneezing? could you not have been sneezing? could he not have been sneezing? could we not have been sneezing? could you not have been sneezing? could they not have been sneezing?