8 sentences

1. 你妈在这干了大半辈子。

   nǐ mā zài zhèi gàn le dà​bàn bèi​zi.

   Your mother worked here most of her life.

   Source: OpenSubtitles

2. 他大半辈子都在国外工作。

   tā dà​bàn bèi​zi dōu zài guó​wài gōng​zuò.

   He has spent most of his life working abroad.

   Source: Dong Chinese Dictionary

3. 走了大半天，我确实有点乏了。

   zǒu le dà​bàn tiān, wǒ què​shí yǒu​diǎn fá le.

   After walking for most of the day, I am indeed a bit tired.

   Source: Dong Chinese Dictionary

4. 冰山浮在水上的部分很小，大半都在下。

   bīng​shān fú zài shuǐ​shàng de bù​fen hěn xiǎo, dà​bàn dōu zài xià.

   The part of the iceberg floating above the water is very small; most of it is below the surface.

   Source: Dong Chinese Dictionary

5. 他在老城区游了大半天，才找到那家书店。

   tā zài lǎo chéng​qū yóu le dà​bàn tiān, cái zhǎo​dào nà jiā shū​diàn.

   He wandered around the old town for half a day before finding that bookstore.

   Source: Dong Chinese Dictionary

6. 玩了大半天，他终于赢了一次，高兴得大叫：“我和了！”

   wán le dà​bàn tiān, tā zhōng​yú yíng le yī cì, gāo​xìng de dà​jiào:“ wǒ hú le!”

   After playing for a long time, he finally won a round and shouted joyfully, 'I won!'

   Source: Dong Chinese Dictionary

7. 他是我们单位的外勤，一年里有大半时间在外出差。

   tā shì wǒ​men dān​wèi de wài qín, yī nián lǐ yǒu dà​bàn shí​jiān zài wài chū​chāi.

   He is a field worker for our unit and spends most of the year on business trips.

   Source: Dong Chinese Dictionary

8. 他今天没来，大半是生病了。

   tā jīn​tiān méi lái, dà​bàn shì shēng​bìng le.

   He didn't come today; he is most likely sick.

   Source: Dong Chinese Dictionary