Bonjour
a- He may be fighting the German army.
b- She can have paid a lot for this loaf of bread.
c- The lieutenant might have found new corpses.
d- They will have to bury them. ( Futur de must : will have to)
e- They couldn't have killed 10 000 men.
f- They can (may) be having lunch.
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Tout dépend du degré de probabilité pour may/might/ can....
Pour must : au past = had to
au futur = will have to
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Bonne fin de journée
