The part of the sentence "you will either need" is correct and usable in written English.
You can use this phrase to point out two options which someone must choose between. For example: "You will either need to apply for a visa before traveling to this country, or prove that you have a valid passport."
Depending on your lender's practice, you will either need to switch to a buy-to-let mortgage or pay a fee for your lender's agreement that you can let the property.
It can take between six and eight weeks to get the go-ahead for your attempt (although a fast-track option is available) and on the day you will either need an official Guinness adjudicator or evidence, which may be in the form of photographs, video footage or signed witness statements.
You will either need to flee for sanity, or get away to celebrate.
You will either need two sets of chairs, one for the ceremony and one for the reception, or you will need to hire a huge staff to move them from one location to the other during the cocktail hour.
Unlike simply watching portions, or trading high fat foods for lower fat versions, you will either need to cook a completely separate meal for others in your home or trade your teens in for infants.
We anticipate that you will either need to add some additional experiments to address the issues and/or modify your conclusions 1) The authors use mTOR phosphorylation as a measure for upregulated mTOR signaling.
If you get the A-OK, you'll either need to paint the walls back to beige before you move out or let the landlord take a repainting fee from your security deposit.
Depending on the make and model of your phone, you'll either need a Philips or Torx screwdriver.
If the glue shows through the ribbon once dried, you'll either need to craft the bow to hide it or choose a different type of glue.
Prom is a semi-formal event, so you'll either need a tuxedo jacket or a suit jacket that can mimic the tuxedo look.
Depending on how you and your friends communicate most effectively, you'll either need some note cards or paper or a telephone and your invitee list containing phone numbers.
