I need to take time off for the second class tomorrow to record on the radio station, so I will send a letter to tell you the reason for taking personal leave in advance.
I need to ask for leave for the second class tomorrow to record at the radio station, so I'll send you a letter in advance to tell you the reason for asking for personal leave<br>
I need to take time off to record on the radio station for my second class tomorrow, so send me a letter informing you in advance of the reason for your leave