英语条件状语从句知识点考点复习    ①if和unless    if表示正面条件意为“如果”，unless表示反面条件意为“除非、如果不”相当于if not，一般情况下可以互换。    If it is sunny tomorrow, we’ll go hiking.    You will be late unless you hurry.    If you don’t have a good command of English grammar, you won’t study English well.    =Unless you have a good command of English grammar, you won’t study English well. 新概念1单词 新概念第一册课文原文 人教版初中英语单词    ②provided/providing（that）、suppose/supposing（that）、so（as）long as、on condition that、in case、assuming（that）、given（that）等。例如：    Supposing/suppose it rains, what should we do?    Providing/provided (that) you can keep the secret to yourself, I can tell you about it.    Assuming (that) an earthquake took place, what would happen to the village?    In case I can’t arrive on time, you can go first without me.       ③only if和if only    only if表示“只要”，only起到强调的作用，引导的从句用陈述语气；if only引导的从句要用虚拟语气，意为“但愿……、如果……就好了”。例如：    Only if you respect others, you’ll be respected.    If only I were a millionaire.    If only I had followed his advice.     Laura Stone is the founder of Sydney by Kayak (皮艇), a company that offers guided kayak tours of Sydney Harbor in Australia. A few years ago, Laura was paddling in the harbor when she ____21____ much garbage floating in the water. Then an ____22____ suddenly struck her. She decided to risk ____23____ a tour program “Tourists ____24____ rubbish on the water as they spend little money touring.” Her program was a big ____25____, which was beyond her expectation.  ____26____, Sydney by Kayak has ever since led four to five garbage-collecting tours every week! At the start of COVID-19, Laura assumed her ____27____ would drop off. Instead, more people came and ____28____ her “Clean Up Kayak” tour, making it more ____29____ than ever. They now _____30_____ take about 441 pounds of garbage out of the harbor each week! “We're surprised that we've _____31_____ it,” Laura said. “Because people can't travel these days, people are _____32_____ to look for something to entertain them. Actually, this tour is not just good for them, but also good for the _____33_____.” Some people come back many times for the _____34_____ of collecting rubbish from the harbor. Julie Greening has _____35_____ ten times so far and says, “While _____36_____ the sunshine, we can do some small things for the earth, which is so _____37_____. If everyone takes a little _____38_____ it's going to be beneficial.” Laura came up with the program _____39_____, and it helps the earth as much as it helps participants. We hope it _____40_____ all over the world, making the world become a better place for us to live in. 21. A. imagined B. noticed C. kept D. stopped 22. A. experience B. idea C. expectation D. action 23. A. starting B. confirming C. learning D. delaying 24. A. throw away B. focus on C. clean up D. pay for 25. A. duty B. step C. dream D. hit 26. A. However B. Therefore C. Moreover D. Instead 27. A. plan B. job C. method D. business 28. A. distributed B. changed C. joined D. shared 29. A. popular B. unique C. expensive D. authentic 30. A. finally B. gradually C. routinely D. fortunately 31. A. improved B. saved C. made D. recognized 32. A. afraid B. proud C. brave D. eager 33. A. environment B. skillfulness C. behavior D. friendship 34. A. generosity B. satisfaction C. explanation D. appointment 35. A. booked B. announced C. wandered D. returned 36. A. finding B. spreading C. enjoying D. escaping 37. A. valuable B. natural C. tough D. complex 38. A. reward B. talent C. potential D. responsibility 39. A. by chance B. in return C. as usual D. on purpose 40. A. passes by B. catches on C. gives out D. goes off