从上个月以来一封信也没有收到过（英语翻译）

I haven't received any letter/email ever since last month.
He/She hasn't received any letter/email ever since last month.

I have not received your mails ever since last month.

I have not received any letter since last month

I've never receive a letter since last month.

I've never received any letter since last month.

从上个月以来一封信也没有收到过（英语翻译）

I've not received any letter since last month.