whether和if在用法上存在一些明显的主要差异
1. 用途：whether主要用作连词，意为“是否，是不是”，引导名词从句或动词不定式短语，也可以引导让步状语从句，表示“不管，无论”。而if主要用于引导条件状语从句，既可以是真实条件从句，也可以是虚拟条件从句。
2. 引导从句的位置：在引导主语从句、表语从句和同位语从句时，通常只用whether，且必须放在句首。然而，如果不放在句首，whether和if都可以引导主语从句。
3. 与or not的连用：当与or not连用时，只能用whether，不能用if。
4. 在介词后的用法：在介词后的宾语从句中，只能用whether，而不能用if。
5. 在不定式前的用法：在不定式之前，只能用whether，不能用if。
6. 引导让步状语从句的用法：whether可以引导让步状语从句，而if不能。
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用作从属连词时.whether和if都意为“是否”。一般情况下，二者可以互换。但以下几种情况中只能用whether：
①与动词不定式连用时。例如:
I couldn't decide whether to go.我不确定是否要去
②引导介词的宾语从句时。例如:
There has been no news about whether they havefinished their work.仍然没有他们是否已经完成工作的消息。
③引导主语从句且里于句首时。例如:
Whether it is true remains a question.
它是真是假还是个问题。
④引导表语从句时。例如:
The question is whether it will rain.问题是会不会下雨。
⑤引导同位语从句时。例如
There is a doubt whether he is fit for the job.
他是否胜任这份工作还有疑问。
⑥与or not直接连用时。例如
Let me know whetheror not you can win the game.请让我知道你是否能移获胜。
综上所述，whether和if在用法上存在差异，需要根据具体的语境和句子的含义来选择合适的连词。在大多数情况下，whether比if具有更广泛的用途和更灵活的应用。
On 23 June 2016, UK (United Kingdom) adults made a historic decision. More than 33 million people voted for the UK to leave the European Union (EU). In the referendum, the result was that around 52% of them—just over half—voted to leave the group of 28 countries. This is called Brexit made up to describe the MBritish Exit". No country had ever left the EU before, so Brexit was a significant moment in European history.
After UK and EU leaders had lots of hard negotiations about how Brexit would work, on 22 nd, January , 2020, Wednesday, the British Parliament finally approved an agreement about the UK's divorcing the EU, which Queen Elizabeth II agreed to on Thursday. The deal was expected to pass in the European Parliament the next week. If everything went well , the UK would leave the EU on January 31, 2020. It did* The UK finally and officially left the EU at 11 pm on this day, ending a process that began three and a half years before. Prime Minister Boris Johnson and Brexit fans celebrated with fireworks and big parties. For many they called it the UK's Independence Day. For many others in the UK , it represented the final stage of something they fought hard to prevent. Now the deal has been signed and Britain has left, but it doesn't mean the life in Britain will change suddenly. Until 31st December 2020, freedom of movement will continue and this means UK citizens will have the right to live and work in the EU.
Making things even more difficult is the fact that the next challenge of Brexit has arrived. The UK and EU now have almost one year to work out the details of the relationship they will have in the future. Many experts express their common concern that making these new agreements will go through the same experience as the original Brexit deal.
32. What does the underlined word "referendum" in Paragraph 1 mean?
A. Explanation. B. Vote. C. Deal. D. Statement.
33. What day was it when the UK left the EU officially?
A. Tuesday. B. Wednesday. C. Thursday. D. Friday.
34. What can we say about Brexit?
A. It was an extremely difficult process. B. It is a great victory for all UK people.
C. It means a temporary loss for the EU. D. It brings UK people a new life overnight.
35. What is the experts5 attitude towards Brexit's next work?
A. Ambiguous. B. Confident. C. Worried. D. Cautious.
