This afternoon, a student in Class 301 came to the office to ask me about the prefixes: in-, com-, con-, and sub-. After explaining the meaning of each, I gave him two more: pro-, ex-and suggested that he consult some online affix dictionaries., which include both prefixes and suffixes.
In fact, once in a while, when teaching new vocabulary words with a prefix, I'll introduce it to the students. For example, when teaching the word "proceed," I told the students the prefix "pro-" means "forward." Then I invited them to give me words they know that start with "pro-."
Though not all words can be learned with the help of affixes, they do help learners acquire more words in a more systematic way.
The following is a website introducing the most commonly used prefixes and suffixes.
http://www.uefap.com/vocab/build/building.htm
According to the website, the commonest prefixes and suffixes are as follows:
"The most common prefixes used to form new verbs in academic English are: re-, dis-, over-, un-, mis-, out-. The most common suffixes are: -ise, -en, -ate, -(i)fy. By far the most common affix in academic English is -ise."
P.S. The suffix "-ise" is British English, which in American English is spelled as "-ize."
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