English Grammar Rules & Mistakes: Learn All of the Essentials: Writing, Speaking, Literature and Punctuation Rules Complete with 10 Key Skills and Over 200 Common Error Examples

Common Mistakes When Writing Infixes
Unlike prefixes and suffixes, infixes are very rare. However, there are
spelling mistakes people make when writing them. Here are some of them:
The plural form of “cupful” is not “cupfuls” but “cupsful.”
Incorrect: cupfuls
Correct: 
cupsful
The plural form of “passerby” is not “passerbies” but “passersby.”
Incorrect: passerbies
Correct: 
passersby
The plural form of “spoonful” is not “spoonfuls” but “spoonsful.”
Incorrect: spoonfuls
Correct: 
spoonfuls
MCQs: Choose the appropriate options from the statements below:
An infix is an affix that can be inserted to the beginning or end of the base
form of a word. (A. True B. false C. I don"t care)
Answer: B
During the encounter between the cops and MS-13 gang at Los Angeles,
innocent ____ were not spared by the deadly gang. (A. passerbies B.

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passersby C. passers by)
Answer: B
Prefixes
Prefixes are syllables or a group of syllables that are added to the beginning
of a word that alters the meaning or grammatical function of that word. With
prefixes, it is possible to create different words that can be easily understood
by writers and speakers everywhere.
The prefixes are highlighted in the examples below:
Disbelieve
Reevaluate
Deactivate
Illegal
Impermeable
Common Errors In Writing And Using Prefixes
Errors in adding prefixes often lead to creating words that do not exist. Below
are some common errors people make when writing or using infixes:
It should be “incorrect” and not “miscorrect” or “discorrect.”
Incorrect: miscorrect
Incorrect: discorrect
Correct: 
incorrect
It should be “terror” or “counterterrorism” and not “noerror” or
“counterterror.”
Incorrect: noerror
Incorrect: counterterror
Correct: 
terror, counterterrorism

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It should be “discontented” and not “uncontented.”
Incorrect: uncontented
Correct: