CORELATIVE CONJUNCTION

'Both' pairs with 'and'.

'But also' pairs with 'not only'; verb agrees with the closer subject ('teacher').

Inversion after 'hardly'.

'Such...that' correlative.

'Neither' is singular; it takes a singular verb.

'Or' pairs with 'either'; verb agrees with 'friends' (plural).

Inversion after 'not only' at the start of a clause.

'Hardly' always pairs with 'when'.

'Just as...so' establishes a comparison of similarity.

In a correlative structure, the second clause continues logically.

In 'neither/nor', the verb agrees with the closer subject ('brothers').

Inversion occurs after 'not only' when it starts a sentence.

'Neither' is always paired with 'nor'.

'Not only' is paired with 'but also'.

'Both' is paired with 'and'.

'Either' is paired with 'or'.

'Whether' is paired with 'or'.

'No sooner' is followed by 'than'.

'Scarcely' is paired with 'when'.