I must lash you must lash she must lash we must lash you must lash they must lash
V-ing form
I must be lashing you must be lashing she must be lashing we must be lashing you must be lashing they must be lashing
Perfect
I must have lashed you must have lashed she must have lashed we must have lashed you must have lashed they must have lashed
V-ing perfect
I must have been lashing you must have been lashing she must have been lashing we must have been lashing you must have been lashing they must have been lashing
Negation
Simple form
I mustn't lash you mustn't lash she mustn't lash we mustn't lash you mustn't lash they mustn't lash
V-ing form
I mustn't be lashing you mustn't be lashing she mustn't be lashing we mustn't be lashing you mustn't be lashing they mustn't be lashing
Perfect
I mustn't have lashed you mustn't have lashed she mustn't have lashed we mustn't have lashed you mustn't have lashed they mustn't have lashed
V-ing perfect
I mustn't have been lashing you mustn't have been lashing she mustn't have been lashing we mustn't have been lashing you mustn't have been lashing they mustn't have been lashing
Interrogative form
Simple form
must I lash? must you lash? must she lash? must we lash? must you lash? must they lash?
V-ing form
must I be lashing? must you be lashing? must she be lashing? must we be lashing? must you be lashing? must they be lashing?
Perfect
must I have lashed? must you have lashed? must she have lashed? must we have lashed? must you have lashed? must they have lashed?
V-ing perfect
must I have been lashing? must you have been lashing? must she have been lashing? must we have been lashing? must you have been lashing? must they have been lashing?
Interro-negative form
Simple form
mustn't I lash? mustn't you lash? mustn't she lash? mustn't we lash? mustn't you lash? mustn't they lash?
V-ing form
mustn't I be lashing? mustn't you be lashing? mustn't she be lashing? mustn't we be lashing? mustn't you be lashing? mustn't they be lashing?
Perfect
mustn't I have lashed? mustn't you have lashed? mustn't she have lashed? mustn't we have lashed? mustn't you have lashed? mustn't they have lashed?
V-ing perfect
mustn't I have been lashing? mustn't you have been lashing? mustn't she have been lashing? mustn't we have been lashing? mustn't you have been lashing? mustn't they have been lashing?