Míngtiān / yào / cānjiā / kǎoshì / wǒ / děi / xiān / xiě / yì / zhāng / jiàtiáo / jiāo / gěi / lǎoshī.

明天要参加考试，我得先写一张假条交给老师。

I have an exam tomorrow, so I need to write a leave note and give it to the teacher first.