"if either are" is not correct and is not usable in written English.
You should use "if either one is" instead. For example: "If either one is not available, please let me know."
"If either are not right, the goods will spoil.
If Faustini wins, he will release a cover of the late Whitney Houston's song I Didn't Know My Own Strength, while Haenow and East have recorded a version of the OneRepublic track Something I Need if either are victorious.
If either are over your budget, the 2010 Marqués de Riscal Rioja Reserva, £30, multibuy £22.49, Majestic, £25, Great Western Wine, is sweetly charry in traditional Rioja mould with liquid cherry and gamey fruitiness.
That said, if either are to win, Tidal Bay (11st 10lb) and Long Run (11st 9lb) will need to put in the biggest weight-carrying performance since Red Rum humped 12 stone around to his second victory in 1974.
(During our stay, temperatures inched above 90 F one night, so Luethje's team got its hands on some melons and created a delightfully refreshing watermelon soup). We can't promise that this fruity starter, the scrumptious sweet potato pancakes or even the Hawaiian yellow fin tuna will be on the ever-evolving menu when you visit; if either are, you'll want to make sure to save room on your plate.
If either are in one giant block, you'll be fighting an uphill battle.
