English verb conjugation
MUST CONCAVE

Regular verb: concave - concaved - concaved

Affirmation

Simple form	V-ing form
I must concave you must concave he must concave we must concave you must concave they must concave	I must be concaving you must be concaving he must be concaving we must be concaving you must be concaving they must be concaving
Perfect	V-ing perfect
I must have concaved you must have concaved he must have concaved we must have concaved you must have concaved they must have concaved	I must have been concaving you must have been concaving he must have been concaving we must have been concaving you must have been concaving they must have been concaving

Negation

Simple form	V-ing form
I mustn't concave you mustn't concave he mustn't concave we mustn't concave you mustn't concave they mustn't concave	I mustn't be concaving you mustn't be concaving he mustn't be concaving we mustn't be concaving you mustn't be concaving they mustn't be concaving
Perfect	V-ing perfect
I mustn't have concaved you mustn't have concaved he mustn't have concaved we mustn't have concaved you mustn't have concaved they mustn't have concaved	I mustn't have been concaving you mustn't have been concaving he mustn't have been concaving we mustn't have been concaving you mustn't have been concaving they mustn't have been concaving

Interrogative form

Simple form	V-ing form
must I concave? must you concave? must he concave? must we concave? must you concave? must they concave?	must I be concaving? must you be concaving? must he be concaving? must we be concaving? must you be concaving? must they be concaving?
Perfect	V-ing perfect
must I have concaved? must you have concaved? must he have concaved? must we have concaved? must you have concaved? must they have concaved?	must I have been concaving? must you have been concaving? must he have been concaving? must we have been concaving? must you have been concaving? must they have been concaving?

Interro-negative form

Simple form	V-ing form
mustn't I concave? mustn't you concave? mustn't he concave? mustn't we concave? mustn't you concave? mustn't they concave?	mustn't I be concaving? mustn't you be concaving? mustn't he be concaving? mustn't we be concaving? mustn't you be concaving? mustn't they be concaving?
Perfect	V-ing perfect
mustn't I have concaved? mustn't you have concaved? mustn't he have concaved? mustn't we have concaved? mustn't you have concaved? mustn't they have concaved?	mustn't I have been concaving? mustn't you have been concaving? mustn't he have been concaving? mustn't we have been concaving? mustn't you have been concaving? mustn't they have been concaving?