I can marvel you can marvel he can marvel we can marvel you can marvel they can marvel
V-ing form
I can be marvelling you can be marvelling he can be marvelling we can be marvelling you can be marvelling they can be marvelling
Perfect
I can have marvelled you can have marvelled he can have marvelled we can have marvelled you can have marvelled they can have marvelled
V-ing perfect
I can have been marvelling you can have been marvelling he can have been marvelling we can have been marvelling you can have been marvelling they can have been marvelling
Negation
Simple form
I cannot marvel you cannot marvel he cannot marvel we cannot marvel you cannot marvel they cannot marvel
V-ing form
I cannot be marvelling you cannot be marvelling he cannot be marvelling we cannot be marvelling you cannot be marvelling they cannot be marvelling
Perfect
I cannot have marvelled you cannot have marvelled he cannot have marvelled we cannot have marvelled you cannot have marvelled they cannot have marvelled
V-ing perfect
I cannot have been marvelling you cannot have been marvelling he cannot have been marvelling we cannot have been marvelling you cannot have been marvelling they cannot have been marvelling
Interrogative form
Simple form
can I marvel? can you marvel? can he marvel? can we marvel? can you marvel? can they marvel?
V-ing form
can I be marvelling? can you be marvelling? can he be marvelling? can we be marvelling? can you be marvelling? can they be marvelling?
Perfect
can I have marvelled? can you have marvelled? can he have marvelled? can we have marvelled? can you have marvelled? can they have marvelled?
V-ing perfect
can I have been marvelling? can you have been marvelling? can he have been marvelling? can we have been marvelling? can you have been marvelling? can they have been marvelling?
Interro-negative form
Simple form
can I not marvel? can you not marvel? can he not marvel? can we not marvel? can you not marvel? can they not marvel?
V-ing form
can I not be marvelling? can you not be marvelling? can he not be marvelling? can we not be marvelling? can you not be marvelling? can they not be marvelling?
Perfect
can I not have marvelled? can you not have marvelled? can he not have marvelled? can we not have marvelled? can you not have marvelled? can they not have marvelled?
V-ing perfect
can I not have been marvelling? can you not have been marvelling? can he not have been marvelling? can we not have been marvelling? can you not have been marvelling? can they not have been marvelling?