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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