Expression: 'Rewrite the following sentence using...'

Hi

Could you please tell me which one of the following sentences is more natural and correct?

1- Rewrite the following sentences [color=red]using the correct forms of the underlined verbs.

2-Rewrite the following sentences [color=red]by using the correct forms of the underlined verbs.

Tom

Hi Tom,

I would plump for sentence 1. The addition of ‘by’ isn’t really needed because what you have to do is quite clear. You would use ‘by’ in a sentence like the following because you need to be told how:

Open the tin by using the key that you will find on the base.

A