: State the number of the following nouns and give the corresponding singular or plural forms:

photo, dwarf, moose, score, species, crossroads, algae, mouthful, man-child, plateau

Photo - sing, photos
Dwarf - sing, dwarves
Moose - sing, moose
Score - sing, scores
Species - plur, species
Crossroads - plur, crossroad
Algae - plur, alga
Mouthful - sing, mouthfuls
Man-child - sing, man-children
Plateau - sing, plateaus