Most people are not aware that English grammar is not taught in Singapore schools. Neither is it taught in any other school all over the world except those in Britain which recently re-introduced grammar in their curriculum because of the prudent educational policy of the Tory government. However, parents in Britain have staged huge protests against this. They don't want their kids to be taught grammar.
Many people don't realise that most English-speaking people are grammar illiterates. This has everything to do with the history of English teaching. In the 1960s, educators came up with the novel idea that English grammar was too difficult for children and it would take away their interest in creative writing. This idea soon spread to schools in all other parts of the world and children were taught how to communicate effectively and correctly in English but grammar itself was left out. However, it became clear a few years ago to educators in Britain that this was a huge mistake. We now have a whole generation of people who may be English-speaking but have no knowledge of English grammar at all. The government in the UK took the decision, even though it's an unpopular one, to re-introduce English grammar in all schools and make it essential for all 11-year-olds to sit an examination that tests their knowledge of grammar.
It was in this context that Nick Gibb, the UK education minister embarrassed himself when a BBC presenter asked him if 'after' in the sentence 'I went to the cinema after I'd eaten my dinner' was a preposition or a subordinating conjunction.