Prefixes & suffixes
Prefixes
Prefixs are added to the beginning of a word to make a new
word, eg mis+take. Some common prefixes are 'mis', 'dis', 're', 'for', 'anti',
'ante', 'sub', 'un' and 'in'. New words are made by placing a prefix in front
of a word. It is helpful to know the meanings of prefixes. Prefix 're' means again, therefore reappear means
to appear again.
Common prefix meanings
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pre - before
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mis - bad(ly)
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sub - under
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inter - between
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semi - half
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The following prefixes of 'im', 'ir', 'il', 'in' and 'un'
can be added to the beginning of words to make them into a negative.
Examples
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im + possible = impossible
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ir + responsible = irresponsible
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il + legal = illegal
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in + active = inactive
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un + happy = unhappy
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Suffixes
Letters added to the end of a main word are called suffixes.
Common suffixes are: 'ed', 'ful', 'ly', 'ing', 'able', 'ance', 'ence', 'ness'.
Example
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harm + less = harmless
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When 'full' is added to a word you drop the final 'l'. If
you add 'ly' to any word ending with 'ful' you keep the existing 'l'.
Example
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hand + full = handful
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rest + full = restful
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restful + ly = restfully
ที่มา: https://www.dlsweb.rmit.edu.au/lsu/content/4_WritingSkills/writing_tuts/spelling_LL/rules3.html
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