Are the below sentences correct? Please advise.

  1. Sorry, we are out of small cup. How about if you get a medium or large drink and I will charge you as a small one.
  2. I will charge you a large drink as a small one.
  3. Please check the expiry date of the milk. Buy those that have the farthest/latest expiry date.

Are the above mentioned sentences correct? Please advise.

I’d put it as follows:

  1. Sorry, we are out of small cups. How about getting a medium or large drink and I won’t charge you extra
  2. I will charge you for a large drink as a small one.
  3. Please check the expiry date of (the) milk. Buy one with the farthest expiry date.

(I wonder if ‘drink by date’ is also in use.)

My suggestion -

  1. Sorry, we are out of small cups. How about a medium or large drink and I will charge you as for a small one.
    2) I will charge you the small cup rate for a large one
  2. Please check the expiry date of the milk. Buy those that have the longest expiry date.

I’m also wondering if there’s any difference between furthest\longest expiry\expiration date.