3 sentences

1. 我们能向他们发信号吗？

   wǒ​men néng xiàng tā​men fā xìn​hào ma?

   Can we signal them?

   Source: OpenSubtitles

2. 她给他们发信号。

   tā gěi tā​men fā xìn​hào.

   She signaled them.

   Source: OpenSubtitles

3. 他发了遇险信号。

   tā fā le yù xiǎn xìn​hào.

   He sent a distress signal.

   Source: OpenSubtitles