Sure, here are sentences using Chinese zodiac idioms in English, suitable for first graders:
1. The Monkey King always plays tricks, just like the idiom "A monkey is never still." (猴子总是爱玩弄，就像成语“猴子永不闲。”)
2. The Rooster crows early, and that's why the idiom "A rooster crows early to bring the dawn" is used. (公鸡总是早早地叫，这就是成语“公鸡司晨报晓”的由来。)
3. The Dog is loyal and honest, just like the idiom "As loyal as a dog." (狗忠诚且诚实，就像成语“狗忠诚。”)
4. The Dragon is majestic, and that's why we have the idiom "The dragon soars in the sky." (龙非常威严，这就是成语“龙腾云海”的由来。)
5. The Horse runs swiftly, just like the idiom "A horse can run fast." (马跑得快，就像成语“马疾风快。”)
6. The Snake is elusive and mysterious, just like the idiom "As cunning as a snake." (蛇狡猾且神秘，就像成语“蛇蝎心肠。”)
7. The Pig is greedy and naive, just like the idiom "Pigs are greedy and foolish." (猪贪婪且天真，就像成语“猪油蒙心。”)
8. The Rat is clever and quick, just like the idiom "Rats are smart and alert." (鼠聪明且机敏，就像成语“鼠目寸光。”)
9. The Ox is hardworking and patient, just like the idiom "As hardworking as an ox." (牛勤奋且耐心，就像成语“牛脾气。”)
10. The Tiger is fierce and brave, just like the idiom "The tiger has the courage of a mountain." (虎勇猛且勇敢，就像成语“虎啸山林。”)
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