Today we will learn about correlative conjunction.
Correlative conjunctions are also called paired conjunctions.
Paired conjunctions are two subjects connected by two words, such as neither…nor, not…only, and but…also.
The conjunctions connect two balanced clauses, phrases, or words.
You can also check the theory here https://englishtips4u.com/2015/08/09/engclass-correlative-conjunction/
The two elements connected by both…and take a plural verb.
When two elements are connected by not only…but also, either…or, or neither…nor, the element that is closer to the verb determines whether the verb is singular or plural.
- Both my brother and my sister are here.
Not only my brother but also my sister is here.
Not only my sister but also my parents are here.
Neither my brother nor my sister is here.
Neither my sister nor my parents are here.
The theory here is taken from ‘Understanding and Using English Grammar’ by Betty Schrampfer Azar.