Chinese does not have ‘grammar’ the way European languages do because words are not inflected. There are no plurals, noun cases or past tense. All the memorization of declensions you have to do when you study, say, Germanic, Slavic and Romance languages—that kind of stuff is absent from Chinese entirely (though you would of course be foolish to conclude that Chinese is therefore easy). So how are the relationships between words indicated? Context, adverbs and particles.
Let’s look at verb tense (specifically past tense) and aspect (specifically completed aspect) in Singlish as influenced by Chinese.