English verb conjugation
MUST DRAIN

Regular verb: drain - drained - drained

Affirmation

Simple form	V-ing form
I must drain you must drain he must drain we must drain you must drain they must drain	I must be draining you must be draining he must be draining we must be draining you must be draining they must be draining
Perfect	V-ing perfect
I must have drained you must have drained he must have drained we must have drained you must have drained they must have drained	I must have been draining you must have been draining he must have been draining we must have been draining you must have been draining they must have been draining

Negation

Simple form	V-ing form
I mustn't drain you mustn't drain he mustn't drain we mustn't drain you mustn't drain they mustn't drain	I mustn't be draining you mustn't be draining he mustn't be draining we mustn't be draining you mustn't be draining they mustn't be draining
Perfect	V-ing perfect
I mustn't have drained you mustn't have drained he mustn't have drained we mustn't have drained you mustn't have drained they mustn't have drained	I mustn't have been draining you mustn't have been draining he mustn't have been draining we mustn't have been draining you mustn't have been draining they mustn't have been draining

Interrogative form

Simple form	V-ing form
must I drain? must you drain? must he drain? must we drain? must you drain? must they drain?	must I be draining? must you be draining? must he be draining? must we be draining? must you be draining? must they be draining?
Perfect	V-ing perfect
must I have drained? must you have drained? must he have drained? must we have drained? must you have drained? must they have drained?	must I have been draining? must you have been draining? must he have been draining? must we have been draining? must you have been draining? must they have been draining?

Interro-negative form

Simple form	V-ing form
mustn't I drain? mustn't you drain? mustn't he drain? mustn't we drain? mustn't you drain? mustn't they drain?	mustn't I be draining? mustn't you be draining? mustn't he be draining? mustn't we be draining? mustn't you be draining? mustn't they be draining?
Perfect	V-ing perfect
mustn't I have drained? mustn't you have drained? mustn't he have drained? mustn't we have drained? mustn't you have drained? mustn't they have drained?	mustn't I have been draining? mustn't you have been draining? mustn't he have been draining? mustn't we have been draining? mustn't you have been draining? mustn't they have been draining?