| Definition -
The use of the auxiliary verbs do, did, didn't, don't, etc. in negative or interrogative sentences, e.g. Do you sing?
1. This construction is only found in five of the world's (approx.) 6000 languages, two of which are Cornish and Welsh. The latter has led to the Celtic Hypothesis, a claim that this construction entered English because of the close contact between the invading Anglo-Saxons and the aboriginal Celts.