Correlative and Formal Linkers

Some conjunctions work in pairs, with each half marking one element of a balanced structure. These are correlative conjunctions — they connect two grammatically equal parts and signal the relationship between them. Beyond correlatives, formal writing has its own set of linking words that rarely appear in everyday speech but are standard in essays, reports, and academic texts.

The basic correlative pairs both...and, either...or, and neither...nor are covered separately. This lesson focuses on the remaining correlative patterns and the linkers that belong to formal register.

Not only...but also

This pair adds emphasis — the second element carries extra weight, as if to say "and what's more."

When not only opens a sentence, the subject and auxiliary verb invert — the same word order as in questions.

Compare with mid-sentence position, where no inversion happens:

The word also can shift position or be dropped entirely in less formal contexts: Not only was he late, but he forgot the documents. The meaning stays the same.

Whether...or

This pair presents two possibilities. It works in two main patterns.

As a connector between clauses:

Before infinitives, when describing a choice:

In the first pattern, whether...or often introduces a condition that does not change the outcome — the meaning is close to "regardless of." In the second, it frames an open choice between two actions.

No sooner...than

This pair describes two events in rapid sequence: one thing happened, and almost immediately the other followed. It belongs to formal writing and storytelling.

When no sooner opens the sentence, inversion is required — the auxiliary verb comes before the subject. This is the standard form in writing. In speech, people usually avoid the construction altogether and say something like As soon as we sat down, the waiter came over.

A mid-sentence version without inversion also exists but sounds less natural:

Hardly/scarcely...when

These work like no sooner...than — two events in quick succession — but with a different second half: when instead of than.

The same inversion rule applies: hardly or scarcely at the front of the sentence triggers subject-auxiliary inversion. Scarcely is slightly more formal than hardly; both are rare in casual conversation.

Note the tense pattern: the first clause uses past perfect (had finished, had landed), and the second uses past simple (asked, started). This reflects the sequence — the first event was already complete when the second began.

Parallel structure in correlative pairs

Every correlative conjunction demands that its two halves introduce the same grammatical form. If a noun follows the first half, a noun must follow the second. If a verb follows the first, a verb follows the second.

Both halves introduce a noun. Placing the pair incorrectly breaks the balance:

This parallel structure rule applies to all correlative pairs, including the ones covered elsewhere. It is the single most common source of errors with these constructions.

Formal written linkers

Academic essays, business reports, and official documents use a set of linking words that sound out of place in everyday conversation. Knowing them is essential for reading formal texts and for writing at an advanced level.

Addition

Furthermore and moreover add a point that strengthens the previous one. They are formal equivalents of also or what's more.

Both sit at the start of a sentence, followed by a comma. In terms of meaning, they are interchangeable — the choice is a matter of personal style.

Contrast

Nevertheless and nonetheless signal that the second statement is true despite the first — formal versions of but still or even so.

Whereas introduces a direct comparison between two facts. It works like while in its contrastive sense but sounds more precise.

In contrast, by contrast, and on the contrary each handle contrast differently. In contrast and by contrast compare two different things. On the contrary corrects a false assumption — it means "the opposite is true."

Result

Consequently, hence, thus, and thereby all express cause and effect. They are formal alternatives to so or therefore.

Consequently is the most common of the four in modern writing. Hence often appears without a following clause, linking directly to a noun phrase. Thus and thereby tend to appear before a participle (-ing form).

A note on register

All the formal linkers in this lesson — furthermore, nevertheless, consequently, whereas, and the rest — belong to written English. In conversation, simpler words do the same job: also, but, so, while.

Using formal linkers in casual speech sounds stiff and unnatural. Using casual connectors in an academic essay sounds imprecise. The skill is matching the linker to the context.

Common mistakes

Inversion after not only

Inversion after no sooner / hardly / scarcely

Mixing pairs

Parallel structure

Register mismatch