“la” is not Singaporean Chinese! It’s also Malaysian - generally, Southeast Asian Chinese. It’s a result of long time exposure to Malay. It is a multifunctional, multitone thing.
Tone Chinese has 5 levels of tone, from low (1) to high (5).
For those in the know, the yin in Chinese noted as 55, yang as 35, shang 213 and qu is 51.
5 is similar to reading English at a very high pitch and 1 is akin to trying to mutter things under your breath. So you change your tone accordingly.
Tone is used together with stress. How do you stress things in Chinese? You either slow down your reading – “Bu. Yao. la” (ie No. Way.) or lengthen your reading (and therefore the rate you change your tones) – Bu yaaaooo la.
Or you either shout to express extremes in emotion eg in distress or joy. Of course, whether you’re happy or not depends on what you shout. Also, facial and hand gestures tell a great deal.
Just before I forget about the "la"s and "lo"s (known as “tanci”)
“la”/“le” - used somewhat to indicate past tense, or that something has already happened. eg
“Ta lai la!” There he comes!
“Bu yao la” No… implies that the speaker has decided against the topic.
“a” – implies surprise and exclamation. Also, agreement
“Hao a!” That’s great!
“A, ta pao de zhen kuai!” He runs really fast!
“A, rensheng shi duome de cuiruo!” Ah, the fragility of life!
“ne” – implies questioning
“Tamen dou you renwu le, wo ne?” They have their own duties, what about me?
“ne” also indicates that something is being carried out at the time of speech.
“Bie xianzai zou, waimian hai zai xia yu ne” Don’t go now, it’s still raining.
“ne” – to affirm something and convince
“Wo de shouhuo bu xiao ne” I benefitted quite a lot.
“ma3” - implies something is obvious, to suggest, to state the topic
“Benlai jiu shi zheyang ma!” It’s always been like that!
“Bie zuo zheme kuai ma!” Don’t walk that quickly (ie Slow down!)
“Kexue ma, ding nan de” (As for) Science, it’s quite difficult (for me)
“ma1” – to question
“Ni hao ma?” How are you?
Should be all, I can’t squeeze anything else out…