Common Usage & Traps
- 一杯茶 — a cup of tea
- 杯子 — cup, glass
- 一杯水 — a glass of water
- 茶杯 — teacup
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一个杯一个杯子杯 alone is a measure word or bound morpheme; to mean a physical cup, add the noun suffix 子.
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喝杯喝一杯In Mandarin, the measure word 杯 needs a numeral before it when used with a verb; omitting 一 is unnatural in standalone sentences.