I need your help

Hello Ma’am,

Q 1 : What’s the difference between these two phrases?

(A) There’s no need for you to concern yourself with his problem.
(a) There’s no need to concern yourself with his problem.

(B) There’s no need for you to concern yourself with what happened.
(b) There’s no need to be concerned with what happened.

Q 2 : Which one(s) is(are) correct?

(A) It’s nothing short of a bizarre.
(B) It’s nothing short of bizarre.
© Her reaction was nothing short of a bizarre.

Not a lot. In each set the first places more emphasis on the ‘you’.

It’s nothing short of bizarre. (Meaning - it is bizarre.)
Her reaction was nothing short of bizarre. (Meaning - her reaction was bizarre.)

Hello,

Is there any other way to express the same concept? (make it look like natural)

-> Let’s repair the car first. As for selling it, we can decide later.

Let’s get the car repaired first and we can worry about selling it later.

Let’s have the car repaired before we worry about selling it.

Let’s not worry about selling the car until it is repaired.

Let’s get the car fixed for now. We can concern ourselves with selling it after that.

Before we worry about selling the car let’s get it fixed up.

There’s no point in worrying about selling the car until it is fixed, so let’s concentrate on that first.

… and many more permutations.

what happened . i will help you