•  1. TESOL is a profession
  The field of teaching English to speakers of other languages (TESOL) is a professional   activity that requires specialized training. The fact that someone speaks English as a   native language does not qualify that person to teach.
  English as a second language (ESL) and English as a foreign language (EFL) educators   work all over the world in various contexts in the public and private sectors. They work   in countries where English is spoken only as a foreign language, such as in Japan and   Saudi   Arabia, as well as in countries where English is the dominant language, as in   Australia,   Canada, England, and the United States.

•  To really understand words, students have to know:
  1.What they mean.
  2.What other words they are used with.
  3.Which situations they are used in.
  4.What the social consequences of their use can be (e.g. saying "scram" has different   social consequences from saying, "Please leave."). The best way to make sure that   students know these things about vocabulary is to teach the vocabulary through use in   realistic situations. If the situation is clear, the meaning and use of the vocabulary item   also becomes clear. Teaching vocabulary through lists often results in students knowing   how words are pronounced and what one meaning of a word is, but they really do not   know how to use the words correctly.