It's not clear who wrote this letter.とは 意味・読み方・使い方

It is not clear who wrote this letter.

It isn't clear who wrote this letter.

It's not clear who wrote this letter.

It is not clear who wrote this letter.

It is still a mystery who wrote the letter.

I don't know who wrote this letter.

This letter won't go into the envelope.

This letter is wrongly addressed [has the wrong address on it].

Don't bother to answer this note.

The meaning of this letter is unclear.

This letter bears no signature.

This letter has no signature.

This letter is not signed.

This letter isn't signed.

There's no signature on this letter.

This letter hasn't been signed.

I won't reply to this letter.

May I trouble you to post this letter for me?

Do you mind posting this letter for me?

This is his letter, but it is not signed.

There is nothing special interest to me.

This letter is personal, and I don't want anyone else to read it.

This letter is personal. I don't want anyone else to read it.

I haven't got the time to answer these letters.

Mako cannot have written this letter.

This letter is wrongly addressed.

He cannot even write a letter properly.

I couldn't read this letter.

I can't make any sense of this letter.

Don't bother to answer this letter.