English verb conjugation
MUST CLASH

Regular verb: clash - clashed - clashed

Affirmation

Simple form	V-ing form
I must clash you must clash he must clash we must clash you must clash they must clash	I must be clashing you must be clashing he must be clashing we must be clashing you must be clashing they must be clashing
Perfect	V-ing perfect
I must have clashed you must have clashed he must have clashed we must have clashed you must have clashed they must have clashed	I must have been clashing you must have been clashing he must have been clashing we must have been clashing you must have been clashing they must have been clashing

Negation

Simple form	V-ing form
I mustn't clash you mustn't clash he mustn't clash we mustn't clash you mustn't clash they mustn't clash	I mustn't be clashing you mustn't be clashing he mustn't be clashing we mustn't be clashing you mustn't be clashing they mustn't be clashing
Perfect	V-ing perfect
I mustn't have clashed you mustn't have clashed he mustn't have clashed we mustn't have clashed you mustn't have clashed they mustn't have clashed	I mustn't have been clashing you mustn't have been clashing he mustn't have been clashing we mustn't have been clashing you mustn't have been clashing they mustn't have been clashing

Interrogative form

Simple form	V-ing form
must I clash? must you clash? must he clash? must we clash? must you clash? must they clash?	must I be clashing? must you be clashing? must he be clashing? must we be clashing? must you be clashing? must they be clashing?
Perfect	V-ing perfect
must I have clashed? must you have clashed? must he have clashed? must we have clashed? must you have clashed? must they have clashed?	must I have been clashing? must you have been clashing? must he have been clashing? must we have been clashing? must you have been clashing? must they have been clashing?

Interro-negative form

Simple form	V-ing form
mustn't I clash? mustn't you clash? mustn't he clash? mustn't we clash? mustn't you clash? mustn't they clash?	mustn't I be clashing? mustn't you be clashing? mustn't he be clashing? mustn't we be clashing? mustn't you be clashing? mustn't they be clashing?
Perfect	V-ing perfect
mustn't I have clashed? mustn't you have clashed? mustn't he have clashed? mustn't we have clashed? mustn't you have clashed? mustn't they have clashed?	mustn't I have been clashing? mustn't you have been clashing? mustn't he have been clashing? mustn't we have been clashing? mustn't you have been clashing? mustn't they have been clashing?