In the case of teaching grammar to EFL learners, a teacher may feel frustrated when
learners are taught grammatical items separately. Students may become good at
grammar; however, when told to write and speak, they often make grammatical
mistakes. This case is very challenging to solve.
When facing this problem, particularly with adult learners, it is useful to be aware that
there are two kinds of knowledge necessary to gain proficiency in a second language.
These are known as explicit (conscious learning) and implicit (subconscious
acquisition) knowledge (Klein, 1986).