Zero: If the light comes on, the battery is OK., If an ad doesn't tell the truth, the advertiser is committing an offence., If the baby is crying, it is probably hungry., If you are very early, don't expect them to be early., First: If I marry Celia, we'll need the money., If you are going to the US, you'll need a visa., If I see her tomorrow, we won't talk about it., If I don't go there, I won't be able to talk to them.,

Zero vs first conditional sentences

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