must extend
Verbo regular: extend - extended- extended

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must extend
you must extend
he must extend
we must extend
you must extend
they must extend 	I must be extending
you must be extending
he must be extending
we must be extending
you must be extending
they must be extending	I must have extended
you must have extended
he must have extended
we must have extended
you must have extended
they must have extended	I must have been extending
you must have been extending
he must have been extending
we must have been extending
you must have been extending
they must have been extending	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not extend
you must not extend
he must not extend
we must not extend
you must not extend
they must not extend 	I must not be extending
you must not be extending
he must not be extending
we must not be extending
you must not be extending
they must not be extending	I must not have extended
you must not have extended
he must not have extended
we must not have extended
you must not have extended
they must not have extended	I must not have been extending
you must not have been extending
he must not have been extending
we must not have been extending
you must not have been extending
they must not have been extending	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I extend?
must you extend?
must he extend?
must we extend?
must you extend?
must they extend? 	must I be extending?
must you be extending?
must he be extending?
must we be extending?
must you be extending?
must they be extending? 	must I have extended?
must you have extended?
must he have extended?
must we have extended?
must you have extended?
must they have extended? 	must I have been extending?
must you have been extending?
must he have been extending?
must we have been extending?
must you have been extending?
must they have been extending? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not extend?
must you not extend?
must he not extend?
must we not extend?
must you not extend?
must they not extend? 	must I not be extending?
must you not be extending?
must he not be extending?
must we not be extending?
must you not be extending?
must they not be extending? 	must I not have extended?
must you not have extended?
must he not have extended?
must we not have extended?
must you not have extended?
must they not have extended? 	must I not have been extending?
must you not have been extending?
must he not have been extending?
must we not have been extending?
must you not have been extending?
must they not have been extending?