4 sentences

1. 他想必去看我儿子了。

   tā xiǎng​bì qù kàn wǒ ér​zi le.

   He must've gone to see my son.

   Source: OpenSubtitles

2. 那段日子想必很美好。

   nà duàn rì​zi xiǎng​bì hěn měi​hǎo.

   Those must have been wonderful days.

   Source: OpenSubtitles

3. 我今天想必在你的糖果店欠了不少帐。

   wǒ jīn​tiān xiǎng​bì zài nǐ de táng​guǒ​diàn qiàn le bù​shǎo zhàng.

   I must have run up quite a bill at your candy store today.

   Source: UM-Corpus: Education

4. 我今天想必在你的面包店欠了不少帐。

   wǒ jīn​tiān xiǎng​bì zài nǐ de miàn​bāo​diàn qiàn le bù​shǎo zhàng.

   I must have run up quite a bill at your bakery today.

   Source: UM-Corpus: Education