must house-sit
Verbo irregular: house-sit - house-sat- house-sat

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must house-sit
you must house-sit
he must house-sit
we must house-sit
you must house-sit
they must house-sit 	I must be house-siting
you must be house-siting
he must be house-siting
we must be house-siting
you must be house-siting
they must be house-siting	I must have house-sat
you must have house-sat
he must have house-sat
we must have house-sat
you must have house-sat
they must have house-sat	I must have been house-siting
you must have been house-siting
he must have been house-siting
we must have been house-siting
you must have been house-siting
they must have been house-siting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not house-sit
you must not house-sit
he must not house-sit
we must not house-sit
you must not house-sit
they must not house-sit 	I must not be house-siting
you must not be house-siting
he must not be house-siting
we must not be house-siting
you must not be house-siting
they must not be house-siting	I must not have house-sat
you must not have house-sat
he must not have house-sat
we must not have house-sat
you must not have house-sat
they must not have house-sat	I must not have been house-siting
you must not have been house-siting
he must not have been house-siting
we must not have been house-siting
you must not have been house-siting
they must not have been house-siting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I house-sit?
must you house-sit?
must he house-sit?
must we house-sit?
must you house-sit?
must they house-sit? 	must I be house-siting?
must you be house-siting?
must he be house-siting?
must we be house-siting?
must you be house-siting?
must they be house-siting? 	must I have house-sat?
must you have house-sat?
must he have house-sat?
must we have house-sat?
must you have house-sat?
must they have house-sat? 	must I have been house-siting?
must you have been house-siting?
must he have been house-siting?
must we have been house-siting?
must you have been house-siting?
must they have been house-siting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not house-sit?
must you not house-sit?
must he not house-sit?
must we not house-sit?
must you not house-sit?
must they not house-sit? 	must I not be house-siting?
must you not be house-siting?
must he not be house-siting?
must we not be house-siting?
must you not be house-siting?
must they not be house-siting? 	must I not have house-sat?
must you not have house-sat?
must he not have house-sat?
must we not have house-sat?
must you not have house-sat?
must they not have house-sat? 	must I not have been house-siting?
must you not have been house-siting?
must he not have been house-siting?
must we not have been house-siting?
must you not have been house-siting?
must they not have been house-siting?