Subject + 请假 + (了)
The verb 请假 (qǐngjià) means 'to ask for leave' or 'to take time off.' It combines 请 (to request) with 假 (leave, vacation). It is used when someone formally requests permission to be absent from work, school, or another obligation.
我明天想请假去看牙医。
Wǒ míngtiān xiǎng qǐngjià qù kàn yáyī.
I'd like to take a day off tomorrow to see the dentist.
她因为家里有事请了三天假。
Tā yīnwèi jiā lǐ yǒu shì qǐng le sān tiān jià.
She took three days off because of a family matter.
你请假的话需要提前跟主管说一声。
Nǐ qǐngjià de huà xūyào tíqián gēn zhǔguǎn shuō yī shēng.
If you want to take time off, you need to inform your supervisor in advance.