If I get lost on the way to your house, - I'll use the GPS on my car, If there's a red sign or an error message on the computer screen, - you have a virus, You can't read the articles on the website - if you don't subscribe, If you click on the link, - it downloads the video for free, I'll call you from the top of the mountain - if I get a phone signal, I only write my blog - if I have something interesting to write about,

zero and first conditional

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