2 sentences

1. 他们已决定明晨六点出发。

   tā​men yǐ jué​dìng míng chén liù diǎn chū​fā.

   They've decided to set out at six tomorrow morning.

   Source: AI Challenger 2017

2. 今年圣诞节，我已决定不庆祝了。

   jīn​nián shèng​dàn​jié, wǒ yǐ jué​dìng bù qìng​zhù le.

   I’ve decided not to celebrate Christmas this year.

   Source: CCMatrix