Question

what is the use of primary auxiliary​

Answer 1

Answer:

The most important use of the primary auxiliary do is to help form negative and (most) interrogative clauses (questions) when no other auxiliary is present in the verb phrase. This use of do is referred to as do-insertion (do-support, do-periphrasis).

Answer 2

Answer:

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The most important use of the primary auxiliary do is to help form negative and (most) interrogative clauses (questions) when no other auxiliary is present in the verb phrase. This use of do is referred to as do-insertion (do-support, do-periphrasis)