英语的3个简单的句子改成定语从句

1.This is our classroom,it is on the second floor.
改为 This is our classroom which is on the second floor.
或者 This is our classroom that is on the second floor.
2.Today is may.24th,he was born on may .24th.1999/it was born on may .24th.1999
改为 Today is May.24th on which he was born in 1999.
3.My father has a bus,we go to school by it.
改为 My father has a bus by which we go to school.
多谢楼上提醒!

楼上2. Today is may.24th, he was born on may . 24th. 1999/it was born on may . 24th. 1999
改为 Today is May.24th,1999,on which he was born.
翻译错了 按他翻译是今天是1999.may 24了
1.this is our classroom ...

1.This is our classroom which is on the second floor.
2.Today is may.24th on which he was born in 1999.
3....

1.this is our classroom which /that is on the second floor.
2.Today is may24th when /on which he was born
in 1999
3.My father has a bus on which we go to school.