If you put ice under the sun, it melts , , If you don't understand, you can ask your teacher, , She will tell you the truth if you ask her, , We won't go to the beach if the weather is bad, , If he doesn't understand, he will watch the video again , , If you don't go to school, you don't learn, , You can call people if you have a cellphone, , If you are happy, you smile a lot , .

Zero and first conditional

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