I must conceive you must conceive he must conceive we must conceive you must conceive they must conceive
V-ing form
I must be conceiving you must be conceiving he must be conceiving we must be conceiving you must be conceiving they must be conceiving
Perfect
I must have conceived you must have conceived he must have conceived we must have conceived you must have conceived they must have conceived
V-ing perfect
I must have been conceiving you must have been conceiving he must have been conceiving we must have been conceiving you must have been conceiving they must have been conceiving
Negation
Simple form
I must not conceive you must not conceive he must not conceive we must not conceive you must not conceive they must not conceive
V-ing form
I must not be conceiving you must not be conceiving he must not be conceiving we must not be conceiving you must not be conceiving they must not be conceiving
Perfect
I must not have conceived you must not have conceived he must not have conceived we must not have conceived you must not have conceived they must not have conceived
V-ing perfect
I must not have been conceiving you must not have been conceiving he must not have been conceiving we must not have been conceiving you must not have been conceiving they must not have been conceiving
Interrogative form
Simple form
must I conceive? must you conceive? must he conceive? must we conceive? must you conceive? must they conceive?
V-ing form
must I be conceiving? must you be conceiving? must he be conceiving? must we be conceiving? must you be conceiving? must they be conceiving?
Perfect
must I have conceived? must you have conceived? must he have conceived? must we have conceived? must you have conceived? must they have conceived?
V-ing perfect
must I have been conceiving? must you have been conceiving? must he have been conceiving? must we have been conceiving? must you have been conceiving? must they have been conceiving?
Interro-negative form
Simple form
must I not conceive? must you not conceive? must he not conceive? must we not conceive? must you not conceive? must they not conceive?
V-ing form
must I not be conceiving? must you not be conceiving? must he not be conceiving? must we not be conceiving? must you not be conceiving? must they not be conceiving?
Perfect
must I not have conceived? must you not have conceived? must he not have conceived? must we not have conceived? must you not have conceived? must they not have conceived?
V-ing perfect
must I not have been conceiving? must you not have been conceiving? must he not have been conceiving? must we not have been conceiving? must you not have been conceiving? must they not have been conceiving?