Mnemonics (pronounced /nəˈmɒniks/ with a silent 'm' at the beginning) are short devices (sayings, poems, etc) used to remember longer, more complex ideas or lists (also known as aides memoires or memory aides).
Think of them as poetic versions of string tied around your finger to help remember something!
A good example of a first letter mnemonic is:
Richard Of York Gave Battle In Vain
which is used to remember the colors of a rainbow in the order they appear:
* This article on concordancing examines this rule in detail
The following are mnemonics for grammar rules.
* See the article, Adjective Order for more on this.
Parts of Speech in general are here:
Every name is called a NOUN,
As field and fountain, street and town;
In place of noun the PRONOUN stands,
As he and she can clap their hands;
The ADJECTIVE describes a thing,
As magic wand and bridal ring;
The VERB means action, something done -
To read and write, to jump and run;
How things are done, the ADVERBS tell,
As quickly, slowly, badly, well;
The PREPOSITION shows relation,
As in the street, or at the station;
CONJUNCTIONS join, in many ways,
Sentences, words, or phrase and phrase;
The INTERJECTION cries out, 'Hark!
I need an exclamation mark!'
Through Poetry, we learn how each
of these make up the PARTS OF SPEECH.
When to start a new paragraph can be remembered using the following mnemonic:
Four "T"s, a little writing rhyme
Of Topic, Territory, Talker, Time
When there's a change in one of these
Start a new paragraph if you please.