小升初英语考试中常考的一些成语及其英文表达如下：

1. 爱屋及乌 - Love me, love my dog.

2. 百闻不如一见 - Seeing is believing.

3. 比上不足比下有余 - Worse off than some, better off than many； to fall short of the best, but be better than the worst.

4. 笨鸟先飞 - A slow bird catches a worm.

这些成语不仅考察学生对成语的理解，还考察他们能否将其正确地翻译成英文。建议学生在备考期间多背诵和练习这些成语的英文表达，以提高语言运用能力。

关于“小升初必考英语题目成语”，搜索结果并没有直接提供相关信息。不过，我可以根据自身的知识为您解答。

在小升初英语考试中，成语并不是主要考察的内容，但是一些常用的英语短语（phrases）和固定搭配（collocations）可能会出现在题目中。这些短语和搭配在日常交流中非常常见，掌握它们对于提高英语水平非常重要。

以下是一些常见的英语短语和固定搭配，可能在小升初英语考试中出现：

这些短语在句子中的应用示例如下：

1. I look after my little brother when my parents are not at home.
   • 当我的父母不在家时，我照顾我的小弟弟。
2. She is looking for her lost keys.
   • 她正在寻找她丢失的钥匙。
3. We are looking forward to the summer vacation.
   • 我们期待着暑假。
4. Can you take care of my pet while I’m away?
   • 当我不在的时候，你能照顾我的宠物吗？
5. The plane will take off in an hour.
   • 飞机将在一小时后起飞。

掌握这些短语和固定搭配有助于提高英语表达能力，建议在备考过程中多加练习。

‌小升初必考的英语成语包括以下内容‌：

1. ‌爱屋及乌‌：Love me, love my dog.
2. ‌百闻不如一见‌：Seeing is believing.
3. ‌比上不足比下有余‌：Worse off than some, better off than many; to fall short of the best, but be better than the worst.
4. ‌笨鸟先飞‌：A slow sparrow should make an early start.
5. ‌不眠之夜‌：White night.
6. ‌不以物喜不以己悲‌：Not pleased by external gains, not saddened by personal losses.
7. ‌不遗余力‌：Spare no effort; go all out; do one's best.
8. ‌不打不成交‌：No discord, no concord.
9. ‌拆东墙补西墙‌：Rob Peter to pay Paul.
10. ‌辞旧迎新‌：Bid farewell to the old and usher in the new; ring out the old year and ring in the new.
11. ‌大事化小小事化了‌：Try first to make their mistake sound less serious and then to reduce it to nothing at all.
12. ‌大开眼界‌：Open one's eyes; broaden one's horizon; be an eye-opener.
13. ‌国泰民安‌：The country flourishes and people live in peace.
14. ‌过犹不及‌：Going too far is as bad as not going far enough; beyond is as wrong as falling short; too much is as bad as too little‌。

这些成语不仅在小升初考试中常见，还能帮助学生在日常交流和写作中丰富语言表达，增加文章的文采。