Half takes generally a singular verb, but:
Half the members are not happy.
You can say:
Give him a half piece, or half a piece
half an apple, half of an apple, or a half apple.
All are standard.
Cut into half
Cut into halves (only for extra precision).
Half the members are not happy.
You can say:
Give him a half piece, or half a piece
half an apple, half of an apple, or a half apple.
All are standard.
Cut into half
Cut into halves (only for extra precision).