This document discusses various types of inversion in English grammar: 1) Question inversion, which changes the word order in questions. 2) Subject-auxiliary inversion, which changes the normal subject-verb word order, as in "Along the street came a strange individual." 3) Inversion after negative adverbials, which occurs when negative time expressions like "never" are at the beginning of a clause for emphasis. 4) Inversion can also follow "so" or "such" when used with the verb "be", or after conjunctions like "as", "so", "neither", and "nor" to echo statements.

1. INVERSIONS
Explanations
Source: Advanced Language Practice. Heinemann

2. INVERSION
The term ‘inversion’ covers two different grammatical
operations.
 Using a question form of the main verb.
Not only did he fail to report the absence, but also later
denied that he had not been in class.
Never have I had such a wonderful time!
 Changing the normal positions of verb and
subject.
Along the street came a strange individual.

3. INVERSION AFTER NEGATIVE ADVERBIALS
 This only occurs when the adverbial is at the
beginning of a clause. It is used for rhetorical effect.
Never have I heard a sillier excuse!
 Time expressions: never, rarely, seldom.
These are most commonly used with present perfect or
past perfect, or with modals such as can and could.
Sentences of this type often contain comparatives.
Rarely can a minister have been faced with such a
scandal.
Seldom has the team played so badly.
Rarely had I had such a horrible year.

4. INVERSION AFTER NEGATIVE ADVERBIALS
 Time expressions: hardly, barely, scarcely, no
sooner.
These refer to an event which quickly follows another in
the past. They are usually used with past perfect,
although no sooner can be followed by past simple.
Hardly had the train left the station, when there was an
accident.
Scarcely had I entered the room when the phone rang.
No sooner had I reached the office than I realised it was
locked.
No sooner was the singer back on the stage than it
began to rain.

5. INVERSION AFTER NEGATIVE ADVERBIALS
 After only
Here only combines with other time expressions and is
usually used with past simple.
Only after posting the letter did I remember that I had
written the wrong address.
Other examples are only if/when, only then, only later.
Only if you come to the party will you be able to meet
her.
Only then did I find out about his real identity.
Only later did she learn that he was her boss.

6. INVERSION AFTER NEGATIVE ADVERBIALS
 Note that when only refers to ‘the state of being the only
one’, there is no inversion following it.
Only Mary realised that the door was wide open.
 Phrases containing no/not
These include under no circumstances, on no account, at no
time, in no way, on no condition, not until, not only… but also.
Note that the inverted verb is the verb describing the event
limited by the negative adverbial.
On no condition are they to open the safe without permission.
Not until I got home did I notice that I had lost my keys.
Not only did he have a good time but he also learned English.

7. INVERSION AFTER NEGATIVE ADVERBIALS
 Little
Little also has a negative or restrictive meaning in this
sense:
Little does the government appreciate what the effects
of such a decision will be.

8. INVERSION AFTER SO/SUCH WITH THAT
 This occurs with so and adjectives when the main
verb is be. It is used for emphasis.
So devastating was the fire that some woods may never
recover.
 Such used with be means so much/so great.
Such was the force of the wind that several trees were
uprooted.

9. INVERTED CONDITIONAL SENTENCES WITHOUT
IF -
 Three types of If- sentences can be inverted without
If-. This makes the sentences more formal and the
event less likely.
If they were to escape, there would be a demonstration.
Were they to escape, there would be a demonstration.
If you should hear from them, let me know.
Should you hear from them, let me know.
If I had known, I would have complained.
Had I known, I would have complained.

10. INVERSION AFTER AS, SO, NEITHER
AND NOR
 Inversion after as
This is more common in formal or written language.
We were short of money, as were most people in our
quarter.
I thought, as did my mates, that the lesson was a waste
of time.
 Inversions after so, neither and nor.
These are used in ‘echoing’ statements, agreeing or
disagreeing.
I am going home. – So am I.
I don’t like rice. – Neither/Nor do I.