Abstract
Many research studies have been conducted on how to teach English effectively. One option is the application of cognitive linguistics, which has provided language educators with many implications for ELT. However, despite studies conducted on the use of this theoretical linguistic perspective in teaching several grammatical items, the teaching of prepositions still remains relatively intact, probably because of a view of this word class as a group of items with ‘empty’ content. Additionally, many academic institutions in Vietnam still use traditional grammar instruction in teaching noun plurality. This paper is to suggest how to apply cognitive linguistics to teaching these two grammar points.