Convert Following Sentences into Predicate

a) All animal who can bark are dog.

b) Someone is firing a gun

c) All tigers are not fierce

a=>

let:

A(x): x is an animal.

B(x): x can bark.

D(x): x is a dog.

Then, “All animal who can bark are dog.” is:
∀x A(x) ∧ B(x)→ D(x)

b=>

let:

F(x): x is firing.

G(x): x has gun.

∃x F(x) ∧ G(x)

c=>

let:

T(x): x is a Tiger.

F(x): x is fierce.

Then, “All tigers are not fierce” is:

∃x T(x) ∧ ¬ F(x)