Can someone please help me with a,b,d,f

Define the domain of discourse for two variables x and y to be the set of musicians in an orchestra. Define the following predicates:

S(x): x plays a stringed instrument.

B(x): x plays a brass instrument.

P(x, y): x practices harder than y

Give a quantified expression that is equivalent to the following English statements:

a) There are no brass players in the orchestra.

b) All the string players practice harder than all the brass players.

c) Sam practices more than anyone else in the orchestra.

d) Exactly one person practices more than Sam.

e) There is someone in the orchestra who plays a stringed instrument and a brass instrument.

f) Everyone practices more than Nancy.

g) There is a brass player who practices harder than all the string players.