English verb conjugation
MUST UNDERPAY

Irregular verb: underpay - underpaid - underpaid

Affirmation

Simple form	V-ing form
I must underpay you must underpay he must underpay we must underpay you must underpay they must underpay	I must be underpaying you must be underpaying he must be underpaying we must be underpaying you must be underpaying they must be underpaying
Perfect	V-ing perfect
I must have underpaid you must have underpaid he must have underpaid we must have underpaid you must have underpaid they must have underpaid	I must have been underpaying you must have been underpaying he must have been underpaying we must have been underpaying you must have been underpaying they must have been underpaying

Negation

Simple form	V-ing form
I mustn't underpay you mustn't underpay he mustn't underpay we mustn't underpay you mustn't underpay they mustn't underpay	I mustn't be underpaying you mustn't be underpaying he mustn't be underpaying we mustn't be underpaying you mustn't be underpaying they mustn't be underpaying
Perfect	V-ing perfect
I mustn't have underpaid you mustn't have underpaid he mustn't have underpaid we mustn't have underpaid you mustn't have underpaid they mustn't have underpaid	I mustn't have been underpaying you mustn't have been underpaying he mustn't have been underpaying we mustn't have been underpaying you mustn't have been underpaying they mustn't have been underpaying

Interrogative form

Simple form	V-ing form
must I underpay? must you underpay? must he underpay? must we underpay? must you underpay? must they underpay?	must I be underpaying? must you be underpaying? must he be underpaying? must we be underpaying? must you be underpaying? must they be underpaying?
Perfect	V-ing perfect
must I have underpaid? must you have underpaid? must he have underpaid? must we have underpaid? must you have underpaid? must they have underpaid?	must I have been underpaying? must you have been underpaying? must he have been underpaying? must we have been underpaying? must you have been underpaying? must they have been underpaying?

Interro-negative form

Simple form	V-ing form
mustn't I underpay? mustn't you underpay? mustn't he underpay? mustn't we underpay? mustn't you underpay? mustn't they underpay?	mustn't I be underpaying? mustn't you be underpaying? mustn't he be underpaying? mustn't we be underpaying? mustn't you be underpaying? mustn't they be underpaying?
Perfect	V-ing perfect
mustn't I have underpaid? mustn't you have underpaid? mustn't he have underpaid? mustn't we have underpaid? mustn't you have underpaid? mustn't they have underpaid?	mustn't I have been underpaying? mustn't you have been underpaying? mustn't he have been underpaying? mustn't we have been underpaying? mustn't you have been underpaying? mustn't they have been underpaying?