Verbs

the simple tenses of verbs

The simple present and the simple past are termed "simple" because they are expressed by direct inflection on the verb. English verbs are not inflected for future tense, but expressions with the modal will are often spoken of as "future tense." Some grammars use the term tense to refer what are technically tense and aspect combinations: present perfect, past perfect, present progressive, past progressive, present perfect progressive, and past perfect progressive. Very occasionally, voice (i.e. passive) is treated as a kind of tense.

Finally, some authorities use emphatic tense to refer to some or all constructions using the modal do. Only the basic present and past forms qualify as simple.

(Present, Past, and Future)

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.