PAIRED CONJUCTION

The paired conjunctions can be used to combine two sentences which are parallel, between words by word, phrase by phrase, and clause by clause.

These are the paired conjunctions in English.
1. both . . . and
Example : Both my mom and my sister love japanese food.
2. either . . . or
Example : You could try either swimming or bicycle riding
3. neither . . . nor
Example : Neither Shinta nor Alex has a good studying habit
4. whether . . . or
Example : Whether or not it rains, we are going to walk to the theater
5. not only . . . but also
Example : He is not only handsome but also smart.

These conjunctions are always used in pairs.Sentence elements that should have accrued to be connected in parallel (parallel) according to the grammatical structure. If the subject is singular and the plural is connected, then the closest subject will determine whether it is singular or plural verb.

Source : englisch-hilfen