全是大写字母的英语句子示例如下：

I AM A STUDENT.

THIS IS A EXAMPLE SENTENCE.

BIG IS IMPORTANT.

ALL CAPITAL LETTERS ARE USED IN THIS SENTENCE.

THE FIRST WORD OF EACH SENTENCE IS CAPITALIZED.

建议在实际使用中，根据具体的语境和规则，正确使用大写字母，以确保句子的规范性和可读性。