【HELP】You say a, one, two, several, etc. billion without a final 's' on 'billion'. Billions (of...) can be used if there is no number or quantity before it. Always use a plural verb with billion or billions, except when an amount of money is mentioned.
• 说 a, one, two, several, etc. billion 时, billion 后面不加 s。若前面没有数目或数量,可用 billions (of …)。除非指金额,billion 和 billions 均用复数动词:
Two billion (people) worldwide are expected to watch the game.