4. a) they are girls b) they are teachers c) ? d) we are boys e) you are children's f) we are bankers g) ? 5. a) she isn't a young girl b) I am not a detective c) they aren't ugly cats d) we aren't strong girls e) Steven isn't from Englandf) you aren't nurse g) he isn't a basketball player h) they aren't bottles i) that isn't a fishj) the black cat isn't smallk) this boy isn't lazy