英语作为一门国际语言在现代社会中的重要性不可忽视。在三年级英语下册中，我们将学习到很多常见的单词，并通过例句来加深理解。本文将为大家列举一些常见的单词及其例句，帮助同学们更好地学习和掌握这些单词。
单词：cat
例句：The cat is sleeping on the chair.
单词：dog
例句：I have a black dog.
单词：apple
例句：She likes to eat apples.
单词：book
例句：He is reading a book.
单词：clock
例句：What time is it on the clock?
单词：pen
例句：May I borrow your pen?
单词：school
例句：We go to school from Monday to Friday.
单词：teacher
例句：My teacher is very kind.
单词：friend
例句：I have many friends in school.
单词：happy
例句：She is very happy today.
单词：tree
例句：There is a big tree in front of my house.
