English verb conjugation
MUST PRECHECK

Regular verb: precheck - prechecked - prechecked

Affirmation

Simple form	V-ing form
I must precheck you must precheck he must precheck we must precheck you must precheck they must precheck	I must be prechecking you must be prechecking he must be prechecking we must be prechecking you must be prechecking they must be prechecking
Perfect	V-ing perfect
I must have prechecked you must have prechecked he must have prechecked we must have prechecked you must have prechecked they must have prechecked	I must have been prechecking you must have been prechecking he must have been prechecking we must have been prechecking you must have been prechecking they must have been prechecking

Negation

Simple form	V-ing form
I must not precheck you must not precheck he must not precheck we must not precheck you must not precheck they must not precheck	I must not be prechecking you must not be prechecking he must not be prechecking we must not be prechecking you must not be prechecking they must not be prechecking
Perfect	V-ing perfect
I must not have prechecked you must not have prechecked he must not have prechecked we must not have prechecked you must not have prechecked they must not have prechecked	I must not have been prechecking you must not have been prechecking he must not have been prechecking we must not have been prechecking you must not have been prechecking they must not have been prechecking

Interrogative form

Simple form	V-ing form
must I precheck? must you precheck? must he precheck? must we precheck? must you precheck? must they precheck?	must I be prechecking? must you be prechecking? must he be prechecking? must we be prechecking? must you be prechecking? must they be prechecking?
Perfect	V-ing perfect
must I have prechecked? must you have prechecked? must he have prechecked? must we have prechecked? must you have prechecked? must they have prechecked?	must I have been prechecking? must you have been prechecking? must he have been prechecking? must we have been prechecking? must you have been prechecking? must they have been prechecking?

Interro-negative form

Simple form	V-ing form
must I not precheck? must you not precheck? must he not precheck? must we not precheck? must you not precheck? must they not precheck?	must I not be prechecking? must you not be prechecking? must he not be prechecking? must we not be prechecking? must you not be prechecking? must they not be prechecking?
Perfect	V-ing perfect
must I not have prechecked? must you not have prechecked? must he not have prechecked? must we not have prechecked? must you not have prechecked? must they not have prechecked?	must I not have been prechecking? must you not have been prechecking? must he not have been prechecking? must we not have been prechecking? must you not have been prechecking? must they not have been prechecking?