Verbs

In order to form possessive nouns, an apostrophe is needed, as well as the letter s for singular nouns.

For example, if you are referring to the surface of the table, you would write the table's surface.

If there were several tables, it would be tables' surfaces.

Some words where the singular noun changes form to become a plural will require the 's also, e.g. children's toys

Contradictions are not word forms; contradictions are a logical incompatibility between two or more propositions. Perhaps you meant the word form, contractions.

Contractions and possessive nouns use an apostrophe.

A contraction is a shortened version of the written and spoken words, made by replacing some of the letters with an apostrophe. Examples:

• The words I am = I'm.
• The words I will = I'll.
• The words you are = you're.
• the words you will = you'll.
• the words could not = couldn't.
• the words should not - shouldn't.

To form possessive nouns, an apostrophe s ('s) are added to the end of a word; for some words that already end with an s, just an apostrophe is added after the s at the end of the word. Examples:

• The shoes of my mother = my mother'sshoes.
• The leaves of the tree = the tree'sleaves.
• The trunk of the elephant = the elephant'strunk.
• The traffic of the city = the city'straffic.