1，If it doesn't rain tomorrow，we will go there by bike.如果明天不下雨，我们就骑自行车去那里。
2，If I get there early，I can see the doctor quickly.如果我早早地到那里，我就可以快点看病。
3，If it rains tomorrow ,we will not go to the zoo.如果明天下雨我们就不能去动物园了。
4，If bears are in danger ,they attack people. 如果熊处于危险之中，它们就会攻击人类。
5，If you ask him，he will help you．如果你请他帮忙，他会帮你的。
6，If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。
7，If you have finished the homework， you can go home．如果你作业做完了就可以回家了。
8，If I were you，I would invite him to the party．如果我是你，我会邀请他参加聚会。
9，If he runs he’ll get there in time. 如果他用跑的，他就会及时赶到那儿。
10，If you pull her tail, the cat will scratch you. 如果你拉猫的尾巴，它就会抓你。
11，If the fog gets thicker the plane may be diverted. 如果雾在大一些，飞机可能就会改在别的机场降落
12，If it stops snowing we can go out. 如果雪停了，我们就可以出去。
13，If you want to lose weight you must eat less bread. 如果你想减肥，你必须少吃面包。
14，If you heat ice it turns to water. 如果把冰加热，它就会化成水。
15，If you are looking for Peter you'll find him upstairs. 如果你是在找彼得，上楼就会找到他。
16，If you have finished dinner I'll ask the waiter for the bill. 如果你吃完了，我就叫服务生来算账。
17，If there is a car accident, they will call 110 for help at once. 如果有车祸，他们会立刻打110寻求帮助。
18，If a UFO land in front of me, I go in to look for the alien. 如果有一个UFO降落在我面前，我就去寻找外星人。
19，If you don't have breakfast, you will get hungry soon. 如果你不吃早饭，你将会很快就感到饿的。
20，If you eat too much, you will put on weight，you will put on weight if you eat too much. 如果你吃地太多了，你就会长胖。
21，If you touch the cable, you will get a shock. 如果你接触到电缆你就会被电到。
22，If you gave me some money, I would be very happy. 如果你给我一些钱，我就会很高兴的。
23，If you get up early, you will catch the bus. 如果你早起的话，就能赶上公共汽车。
24，If you want to go skating, wear warm clothes. 如果你想去滑冰，穿上点暖和的衣服。
25，If you have any questions to ask, please come to my office. 如果你有问题要问的话，请到我办公室来
26，If you help me, I'll finish my job soon. 如果你帮我，我讲很快完成我的工作。
27，If you don't hurry up, you'll be late. 如果你不快点，你将会迟到。
28，If he comes back, please tell me. 如果他回来了，请告诉我一声。
29，If there is no buying and selling of animals, there will be no killing in nature. 动物没有买卖就没有杀害。
30， If we pay much attention to the earth, we'll have a better world. 如果我们多关爱地球，就会拥有一个更美好的世界。
