Can someone explain thoroughly what EFL learners get from the task where they have ti put new words into context?Can someone explain this stategy?And also another strategie - using linguistic clues

2 answers

Because English has so many words that can mean the same thing or approximately the same thing, there are subtle nuances in how each is used. Not all synonyms are interchangeable. For example, take a look at the thesaurus entries for "sanguine."
http://thesaurus.reference.com/browse/sanguine

Can you think of ONE SENTENCE in which all these synonyms will work perfectly?
This is interesting, too.
http://www.sdutsj.edus.si/ScriptaManent/2006_1/Jurkovic.html
Scroll about halfway down, to the section called Vocabulary learning strategy instruction model