Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.

If you will buy one shirt, you will get another one free.

you buy

The most appropriate option to substitute the underlined segment in the given sentence is you buy.

The other options are incorrect:

• you would buy is in the past conditional tense, which is used to talk about hypothetical situations that could have happened in the past.
• you have bought is in the present perfect tense, which is used to talk about actions that happened in the past but have an effect on the present.
• No substitution required means that the original sentence is already correct and does not need to be changed.