Объясните, в каком медли употреблены слова в скобках, и напишите, почему

I know( знаю сейчас, поэтому употребляется Present Simple) that its quite a while since I last wrote to you but for the past few weeks I have been doing (Present Perfect Continuous, процесс, который начался несколько недель вспять и длится) so many things at the same time that I hardly had time for have I told (Past Simple, сказал ранее) you that my school is holding (Present Continuous, планы на будущее) a big dance next week ? We are celebrating (Present Continuous, планы на будущее) the end of the school year. As I am a member of the organising committee, I spend (Present Simple, действие происходит непрерывно) most of my time after school trying to work out the details of the event. Do you have (Present Simple, действие постоянное) any good ideas to give me ? What about you ? What have you been doing (Present Perfect Continuous, деяние началось в прошлом и длится на данный момент) lately ? Are you still working (Present Continuous, процесс) at your dad is shop after school ? You known what ? I have just had a great idea!