The phrase "is either because" is grammatically correct and can be used in written English
It is typically used when explaining the reasons or causes behind something. Here is an example sentence: "The reason John left the party early is either because he was feeling sick or because he had to work early in the morning."
This is either because, as above, there is a downstream effect on CO2 production, or because normal CO2 clearance is not required clinically to exert a positive effect on patient outcomes.
But normally this is either because the charterer is in financial trouble or because of disputes over delays.
"This is either because of narrow-minded mentalities or because they have turned into merchants of the crisis".
This is either because she's a talented singer, or because they're appalled at the idea of a child singing a song as sexually charged as this.
If the name column is left blank it is either because a name was yet to be decided or the child died before baptism.
It is either because of people who are a lot smarter than me working on the campaign, a lot more literate, or Spellcheck.
Depending on whom you believe it is either because olive oil is so expensive or more likely that aubergines stuffed with tomatoes taste so delicious!
This is either because they're the person who took all the photographs or because they were sitting at home with a newspaper when the pictures were taken.
If people still do not get them, it is either because the drugs are still too costly, or because the country's health-care system is a mess.
I'm pretty sure she doesn't know who Bruce Campbell is either, because she'd rather stick a lit sparkler in her eye than watch a film called "The Evil Dead".
"But on the whole, the reason why they're in their cells in the daytime is either because the activity isn't available or because no-one's making arrangements to get them from the cell to where the activity is.
