"my"前面应该使用 is。例如：

1. My name is John.

2. My brother is a student.

3. My father is a teacher.

"my"作为所有格代词，后面跟的是名词，而名词的谓语动词形式取决于名词的单复数。如果名词是单数，则用"is"；如果名词是复数，则用"are"。例如：

1. My pencil is red.

2. My friends are playing football.