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 must not drain you must not drain he must not drain we must not drain you must not drain they must not drain	I must not be draining you must not be draining he must not be draining we must not be draining you must not be draining they must not be draining
Perfect	V-ing perfect
I must not have drained you must not have drained he must not have drained we must not have drained you must not have drained they must not have drained	I must not have been draining you must not have been draining he must not have been draining we must not have been draining you must not have been draining they must not 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
must I not drain? must you not drain? must he not drain? must we not drain? must you not drain? must they not drain?	must I not be draining? must you not be draining? must he not be draining? must we not be draining? must you not be draining? must they not be draining?
Perfect	V-ing perfect
must I not have drained? must you not have drained? must he not have drained? must we not have drained? must you not have drained? must they not have drained?	must I not have been draining? must you not have been draining? must he not have been draining? must we not have been draining? must you not have been draining? must they not have been draining?