For those with 'p', 't', 'k' endings, are certainly tone 4. But for those with glottal stop, I do get confused sometimes, luckily the sandhi tones are different. Tone 2 -> 25, tone 4 -> 53 (tone

E.g.: ‘si2’死 (die) and ‘si4’ 閃 (shine/flash, as in ‘si4 na3’ lightning) sound alike but have different sandhi. Also ‘ci2’ 止 (stop) and ‘ci4’ [接] (receive), 'tho2' 討 (cadge, beg) and 'tho4' 妥 (proper).
I just found that the 2nd tone in Taiwanese [http://www.glossika.com/en/dict/taiwanese/tones.htm , audio samples available] is very similar to our tone 8. I remember that tone 2 of Medan Hokkien is also like that.
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