Tom总是帮我打扫教室.英语怎么说？

Tom always helps me to clean the classroom.

TOM ALWAYS HELP ME TO CLEAN THE CLASSROOM.(入门级，中国人常用的）
Tom always on duty instead of me .(偶的美国童鞋是这么说的）
tom on duty with me .
tom on duty follow me .(都是我的美国童鞋建议滴）

TOM ALWAYS HELPS ME TO CLEAN CLASSROOM

Tom often helps me with classroom cleaning.