Conjugação do verbo inglês
MUST BACK

Verbo regular: back - backed - backed

Afirmação

Forma simple	Forma com V-ing
I must back you must back she must back we must back you must back they must back	I must be backing you must be backing she must be backing we must be backing you must be backing they must be backing
Perfeito	Perfeito com V-ing
I must have backed you must have backed she must have backed we must have backed you must have backed they must have backed	I must have been backing you must have been backing she must have been backing we must have been backing you must have been backing they must have been backing

Negação

Forma simple	Forma com V-ing
I must not back you must not back she must not back we must not back you must not back they must not back	I must not be backing you must not be backing she must not be backing we must not be backing you must not be backing they must not be backing
Perfeito	Perfeito com V-ing
I must not have backed you must not have backed she must not have backed we must not have backed you must not have backed they must not have backed	I must not have been backing you must not have been backing she must not have been backing we must not have been backing you must not have been backing they must not have been backing

Forma interrogativa

Forma simple	Forma com V-ing
must I back? must you back? must she back? must we back? must you back? must they back?	must I be backing? must you be backing? must she be backing? must we be backing? must you be backing? must they be backing?
Perfeito	Perfeito com V-ing
must I have backed? must you have backed? must she have backed? must we have backed? must you have backed? must they have backed?	must I have been backing? must you have been backing? must she have been backing? must we have been backing? must you have been backing? must they have been backing?

Forma interro-Negação

Forma simple	Forma com V-ing
must I not back? must you not back? must she not back? must we not back? must you not back? must they not back?	must I not be backing? must you not be backing? must she not be backing? must we not be backing? must you not be backing? must they not be backing?
Perfeito	Perfeito com V-ing
must I not have backed? must you not have backed? must she not have backed? must we not have backed? must you not have backed? must they not have backed?	must I not have been backing? must you not have been backing? must she not have been backing? must we not have been backing? must you not have been backing? must they not have been backing?