what are if...not and unless

powerpoint 演示文稿 if...not and unless whether homm9k_ly what are if...not and unless what is whether? what're difference if and whether? text thank you 😁 image1.jpeg image2.png image3.png image4.png image5.png image6.jpeg image7.jpeg image8.jpeg image9.jpeg image10.jpeg image11.jpeg image12.jpeg image13.jpeg image14.jpeg image15.jpeg image16.jpeg image17.jpeg image18.jpeg image19.jpeg image20.jpeg image21.jpeg

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