再请帮助翻译两句话，多谢！

he will back to China in May, I will sent a email later to check it out.

he will come back to china in may. i will send email as confirmation.

He will be back to china in May, I will confirm through the email.

he will come back to china in May. i will email him to conform

1.He will be back to China in May，and I will send an email to ensure it.
2.He will return China in May，and I will send an email to confirm it.
3.He will come back to China in May， I will email him to conform it.
随便哪个都行啊！
其实一个句子对应可有多种翻译的啊！
只要能准确表达原意就行了啊！

He said that he will come back to China at may and i will send an email to ensure it.