aepmk
1. The choice is incorrect due to the use of the expression
2. The choice has verb tense error due to the use of the expression
Are the above 2 sentences corrrect idiomatically?
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Here's how I like to remember the "due to" versus "because of" situation:
The game was cancelled
because of rain: correct
The cancellation was
due to rain: correct
BUT:
The game was cancelled
due to rain: incorrect
The cancellation was
because of rain: incorrect
You use "because of" to explain an action - that is, to modify a verb. In my first example, "because of rain" is modifying the verb phrase "was cancelled." It's explaining why the action
was cancelled occurred.
You use "due to" to modify a noun. In my second example, "due to rain" is modifying the noun "cancellation".
Now, on to the examples you gave.
Your first example is incorrect. "is incorrect" is a verb phrase (by the way, 'incorrect' is an adjective, not a noun.) So, it's similar to "was cancelled." You'd need to use "because of" instead:
"This choice is incorrect because of the use of the expression"
The second example is less clear. I'm not sure whether "due to the use of the expression" is modifying just the noun 'verb tense error', or whether it's modifying the verb phrase 'has (a) verb tense error'. I think it's technically okay, though, since you can read it as modifying just the noun. (You can't do that with the first example, because 'incorrect' isn't a noun, while 'verb tense error' is a noun.)