Many times people will mark stressed syllables by separating the syllables with dashes and capitalizing the letters of the stressed syllable. In the case of "politics," you would write "POL-i-tics."
This is an informal method that gets the point across. Be aware that there may be a more academic method that is considered proper.
pol - i - tics
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The stress mark on the word "happened" is on the second syllable, "hap-PENED."
The stress mark on 'comb' over the O.
The stress in "kindness" is on the first syllable.
The primary stress mark in the word "cinnamon" is on the first syllable, which is "cin-."
The stress mark in the word "sunset" is on the first syllable: SUN-set.
The stress mark in a word is usually placed on the syllable that is emphasized when spoken. The stress can vary based on the word's origin and pronunciation. To determine where to put the stress mark, consult a dictionary or language reference guide for specific words.
The stress mark in the word "format" is on the first syllable, which is "FOR-mat."
The stress mark on the word "academy" is placed on the first syllable: a-CA-demy.
The stress mark in the word "industrious" is on the second syllable: in-DUS-tri-ous.
The stress mark in the word "ordinary" is placed on the first syllable: OR-di-nary.