4 sentences

1. 让我大胆猜测一下。

   ràng wǒ dà​dǎn cāi​cè yī​xià.

   Let me take a wild guess.

   Source: OpenSubtitles

2. 我想我只是猜测。

   wǒ xiǎng wǒ zhǐ​shì cāi​cè.

   I think I just guessed.

   Source: OpenSubtitles

3. 这一切都只是我的猜测，没有确凿的证据。

   zhè yī​qiè dōu zhǐ​shì wǒ de cāi​cè, méi​yǒu què​záo de zhèng​jù.

   This is all just my speculation; there is no solid evidence.

   Source: Dong Chinese Dictionary

4. 这次会议的安排用意甚殊，引起了各方的猜测。

   zhè cì huì​yì de ān​pái yòng​yì shèn shū, yǐn​qǐ le gè fāng de cāi​cè.

   The arrangement of the meeting had a very unusual purpose, sparking speculation from all sides.

   Source: Dong Chinese Dictionary