请三天假英语

I want to ask for three days` /half an hour`s leave.或I want to ask for a leave of three days/half an hour

can i ask for a *(N days/hours) of leave

我得请三天假I have to ask three days off.

vacate for three days have three days vacation

I want to take a leave of three days/ half an hour.It is half past three in the afternoon now.