3 sentences

1. 他们大约一年前失踪。

   tā​men dà​yuē yī nián​qián shī zōng.

   They went missing about a year ago.

   Source: OpenSubtitles

2. 他几周前失踪了。

   tā jǐ zhōu qián shī zōng le.

   He went missing a few weeks ago.

   Source: OpenSubtitles

3. 他4个月前失踪了。

   tā4 ge yuè qián shī zōng le.

   He disappeared 4 months ago.

   Source: OpenSubtitles