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No, double or multiple contractions are not formal.

While some style guides support the moderate use of common contractions, even single contractions are sometimes discouraged in formal writing. See MLA style on contractions and this roundup of views on contractions.

Edit to address some of the points in the comments:

  • In formal writing, it is appropriate to use contractions if you are quoting a line of text or speech that contains contractions, or if the topic you are discussing is the use of contractions.

  • O'clock is standard and formal.

  • Diacritical marks in words like Qur'an, Hawai'i and Xi'an are not contractions and are not discouraged.

No, double or multiple contractions are not formal.

While some style guides support the moderate use of common contractions, even single contractions are sometimes discouraged in formal writing. See MLA style on contractions and this roundup of views on contractions.

No, double or multiple contractions are not formal.

While some style guides support the moderate use of common contractions, even single contractions are sometimes discouraged in formal writing. See MLA style on contractions and this roundup of views on contractions.

Edit to address some of the points in the comments:

  • In formal writing, it is appropriate to use contractions if you are quoting a line of text or speech that contains contractions, or if the topic you are discussing is the use of contractions.

  • O'clock is standard and formal.

  • Diacritical marks in words like Qur'an, Hawai'i and Xi'an are not contractions and are not discouraged.

2 added 4 characters in body
source | link

No, double or multiple contractions are not formal.

While mostsome style guides support the moderate use of common contractions, even single contractions are sometimes discouraged in formal writing.even single contractions are sometimes discouraged in formal writing. See MLA style on contractions and this roundup of views on contractions.

No, double or multiple contractions are not formal.

While most style guides support the moderate use of common contractions, even single contractions are sometimes discouraged in formal writing. See MLA style on contractions and this roundup of views on contractions.

No, double or multiple contractions are not formal.

While some style guides support the moderate use of common contractions, even single contractions are sometimes discouraged in formal writing. See MLA style on contractions and this roundup of views on contractions.

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source | link

No, double or multiple contractions are not formal.

While most style guides support the moderate use of common contractions, even single contractions are sometimes discouraged in formal writing. See MLA style on contractions and this roundup of views on contractions.