English verb conjugation
MAY STUMBLE

Regular verb: stumble - stumbled - stumbled

Affirmation

Simple form	V-ing form
I may stumble you may stumble he may stumble we may stumble you may stumble they may stumble	I may be stumbling you may be stumbling he may be stumbling we may be stumbling you may be stumbling they may be stumbling
Perfect	V-ing perfect
I may have stumbled you may have stumbled he may have stumbled we may have stumbled you may have stumbled they may have stumbled	I may have been stumbling you may have been stumbling he may have been stumbling we may have been stumbling you may have been stumbling they may have been stumbling

Negation

Simple form	V-ing form
I may not stumble you may not stumble he may not stumble we may not stumble you may not stumble they may not stumble	I may not be stumbling you may not be stumbling he may not be stumbling we may not be stumbling you may not be stumbling they may not be stumbling
Perfect	V-ing perfect
I may not have stumbled you may not have stumbled he may not have stumbled we may not have stumbled you may not have stumbled they may not have stumbled	I may not have been stumbling you may not have been stumbling he may not have been stumbling we may not have been stumbling you may not have been stumbling they may not have been stumbling

Interrogative form

Simple form	V-ing form
may I stumble? may you stumble? may he stumble? may we stumble? may you stumble? may they stumble?	may I be stumbling? may you be stumbling? may he be stumbling? may we be stumbling? may you be stumbling? may they be stumbling?
Perfect	V-ing perfect
may I have stumbled? may you have stumbled? may he have stumbled? may we have stumbled? may you have stumbled? may they have stumbled?	may I have been stumbling? may you have been stumbling? may he have been stumbling? may we have been stumbling? may you have been stumbling? may they have been stumbling?

Interro-negative form

Simple form	V-ing form
may I not stumble? may you not stumble? may he not stumble? may we not stumble? may you not stumble? may they not stumble?	may I not be stumbling? may you not be stumbling? may he not be stumbling? may we not be stumbling? may you not be stumbling? may they not be stumbling?
Perfect	V-ing perfect
may I not have stumbled? may you not have stumbled? may he not have stumbled? may we not have stumbled? may you not have stumbled? may they not have stumbled?	may I not have been stumbling? may you not have been stumbling? may he not have been stumbling? may we not have been stumbling? may you not have been stumbling? may they not have been stumbling?