我的电脑打不了日文，就只能用英文了。

I have to write to you in English because Japanese can not be used on my computer.

youdao

猜，我的中文手写版今天坏了，只能用英文写了。

My Chinese writing pad is dead today …only can write in English…

youdao

不过每一封邮件都只能用英文写，并且必须在信的标题上说明这封信是谁写的，否者你写的信将会直接被删除或者不会被阅读。

Any email must be written in English only... and must have a subject heading which indicates who the message is from otherwise it will be deleted and not read.

youdao