4 sentences

1. 早上他打不开房门。

   zǎo​shang tā dǎ bu kāi fáng​mén.

   In the morning, he couldn't open the door.

   Source: OpenSubtitles

2. 这扇门打不开。

   zhè shàn mén dǎ bu kāi.

   This door will not open.

   Source: Tatoeba

3. 电脑打不开了。

   diàn​nǎo dǎ bu kāi le.

   The computer won't turn on.

   Source: OpenSubtitles

4. 我们打不开门！

   wǒ​men dǎ bu kāi mén!

   We can't open the door!

   Source: OpenSubtitles