What is the prefix of important , certain and definite

Let's start with prefixes.A prefix is a letter or a group of letters that we add to the beginning of a word. Prefixes change the meanings of words. For example, the prefix un- (or u-n) can mean "not," "remove," or "opposite." Adding un-to the word "happy" gives you the word "unhappy," which means not happy.U-n and r-e (or re-) are the two most common prefixes in the English language.Re- means "again" or "back," such as in the words "rethink" "redo" and "repay."Here are a few things to remember when learning prefixes:Different prefixes in English can have similar meanings, such as un-, in- andnon- all of which mean "not" or "opposite of." Also, the prefixes mis-and ir- mean "wrong," "wrongly," or "incorrectly."Notice that double letters are possible. For example, when you add the prefix im- to words that begin with the letter "m," you get two "m"s as in "immeasurable." That's also true when you add un- to words that begin with the letter "n," as in "unnoticeable." The same is true for many other prefixes.When adding a prefix to a word, the spelling of the base word never changes. For example, the prefix un-did not change the spelling of the word "happy." And, the prefix re-would not change the spelling of the word "live" in "relive."Watch out for "lookalikes" – words that look like they contain prefixes but, in fact, do not. For example, theun- in the word "uncle" is not a prefix, nor is the re- in the words "reach" or "real."

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