6 sentences

1. 我教在线大学课程。

   wǒ jiāo zài​xiàn dà​xué kè​chéng.

   I teach online college courses.

   Source: OpenSubtitles

2. 他今天早上还在线。

   tā jīn​tiān zǎo​shang hái zài​xiàn.

   He was online this morning.

   Source: OpenSubtitles

3. 他现在不在线，请稍后再联系。

   tā xiàn​zài bù zài​xiàn, qǐng shāo​hòu zài lián​xì.

   He is offline right now; please contact him later.

   Source: Dong Chinese Dictionary

4. 他总是在线。

   tā zǒng​shì zài​xiàn.

   He is always online.

   Source: Tatoeba

5. 现在通过手机软件就能直接在线缴费。

   xiàn​zài tōng​guò shǒu​jī ruǎn​jiàn jiù néng zhí​jiē zài​xiàn jiǎo​fèi.

   You can now pay fees directly online through a mobile app.

   Source: Dong Chinese Dictionary

6. 这位演员在这部剧里演技在线。

   zhè wèi yǎn​yuán zài zhè bù jù lǐ yǎn​jì zài​xiàn.

   This actor's performance in this drama is excellent.

   Source: Dong Chinese Dictionary