2 added 145 characters in body
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As many sites on the English language explain, "could of" (could've) is commonly written for "could have" - along with "should of" (should've), "might of" (might've) and their cousins.

The error arises from the manner in which people speak and is most common among people more familiar with the spoken rather than the written form of English.

It arises because "could've" sounds so close to "could of". Of course, it's wrong.

www.oxforddictionaries.com/words/could-of-or-could-haveSee:

englishpluswww.oxforddictionaries.com/words/could-of-or-could-have

englishplus.com/grammar/00000204.htm

.com/grammar/00000204.htm, .and many others

As many sites on the English language explain, "could of" (could've) is commonly written for "could have" - along with "should of" (should've), "might of" (might've) and their cousins.

The error arises from the manner in which people speak and is most common among people more familiar with the spoken rather than the written form of English.

It arises because "could've" sounds so close to "could of". Of course, it's wrong.

www.oxforddictionaries.com/words/could-of-or-could-have

englishplus.com/grammar/00000204.htm, and many others

As many sites on the English language explain, "could of" (could've) is commonly written for "could have" - along with "should of" (should've), "might of" (might've) and their cousins.

The error arises from the manner in which people speak and is most common among people more familiar with the spoken rather than the written form of English.

It arises because "could've" sounds so close to "could of". Of course, it's wrong.

See:

www.oxforddictionaries.com/words/could-of-or-could-have

englishplus.com/grammar/00000204.htm

...and many others

1
source | link

As many sites on the English language explain, "could of" (could've) is commonly written for "could have" - along with "should of" (should've), "might of" (might've) and their cousins.

The error arises from the manner in which people speak and is most common among people more familiar with the spoken rather than the written form of English.

It arises because "could've" sounds so close to "could of". Of course, it's wrong.

www.oxforddictionaries.com/words/could-of-or-could-have

englishplus.com/grammar/00000204.htm, and many others