If you (leave) butter out in the sun, it (melt)., If our flight (arrive) on time tonight, we (take) a taxi to the hotel., If Alex (not / study) for the driving test, he (fail) it next week., If you (mix) red and yellow, you (get) orange., If the store (have) a discount tomorrow, I (buy) a new coat., When people (not / sleep) enough, they (feel) tired during the day., If you (press) this button, the machine (start) instantly., If Josh (compete) in the tennis tournament all afternoon, he (feel) exhausted later., When the sun (go) down, the temperature (drop)., My supervisor (give) me a promotion if I (complete) this project on time., If people (not / supervise) young children near deep water, they (endanger) them., If Sarah (not / feel) better tomorrow, she (miss) the team meeting., When students (concentrate) properly, they (understand) complex concepts much faster.

Zero and First conditionals

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