What part of speech is “due-to”
Preposition
Definition:
'due to' is a compound preposition made up of two parts 'due' and 'to'. It functions as a means of introducing a clause which states the cause, reason, or basis of something. Examples include 'due to the weather', 'due to a prior commitment', or 'due to unforeseen events'. In terms of usage, it is nearly identical to 'because of' or 'on account of'.
Examples:
1. She was promoted due to her hard work.
2. He changed his plans due to the bad weather.
3. I was unable to attend due to a prior commitment.
Tips:
the phrase 'due to' should not be followed by a verb. For example, 'due to run' is incorrect; instead, use 'due to the fact that (noun phrase) was running'.