his family would have filed a report by now.他家人肯定已經報案了

file a report 提交報告

If you file a report, things could get a lot worse for me.

你報告上去事情對我而言會變得更糟。

by now到如今； 至此

The building must have been built up by now.

那幢大樓此時一定已經建成。

Her secret remains untold by now.

她的秘密至今仍未透露。

I'm assuming that you have called him and tried to text him.我猜你電話也打過,短信也發過了

assume用法：

1、assume與presume都有“假定”的意思，但是前者只是一種假設，后者是認定是正確的，真實的，

在等待被認定；

2、assume后常接that，而presume后不接that。

I assume that you can do it.

我假定你能做。

I presume you can do it.

我認定你能做。

相關短語:

assume an air of裝出 ... 的樣子

He playfully assumed an air of indifference.

他開玩笑地裝出一副漠不關心的樣子。

She assumed an air of injured innocence.

她裝出一副無辜受累的樣子。