........(i /tell ) you that my school....... ( hold) a big dance next week ? we ......(celebrate) the end of the school year. as i am a member of the organising committee, i ......(spend) most of my time after school trying to work out the details of the event. ......(you/ have) any good ideas to give me ? What about you ? What .......(you/ do) lately ? ........( You/ still /work) at your dad is shop after school ? You known what ? I........( just /have ) a great idea! i tell you that my school hold a big dance next week ? we celebrate the end of the school year. as i am a member of the organising committee, i spend most of my time after school trying to work out the details of the event. you have any good ideas to give me ? What about you ? What you do lately ? You still work at your dad is shop after school ? You known what ? I just have a great idea!

Did I tell you that my school is holding a big dance next week ? We're going to celebrate the end of the school year. As I am a member of the organising committee, I spend most of my time after school trying to work out the details of the event. Do you have any good ideas to give me ? What about you ? What did you do lately ? Do you still work at your dad's shop after school ? You know what ? I've just had a great idea!

Я тебе говорил (-а), что в нашей школе состоится большой танцевальный вечер на следующей неделе? Мы собираемся праздновать завершение школьного года. Как член организационного комитета, после школы я провожу большую часть времени, стараясь разработать детали мероприятия. У тебя есть для меня какие-нибудь хорошие идеи? Как насчёт тебя? Чем ты занимался (-лась) в последнее время? Ты всё ещё работаешь в магазине своего отца после школы? А знаешь что? У меня только что появилась великолепная идея!

Я немного поправлю. все замечательно, только пропущены глагол связка и модальный глагол. И время немного не то.

Did I tell you that my school is holding a big dance next week ? We will celebrate the end of the school year. As I am a member of the organising committee, I spend most of my time after school trying to work out the details of the event. Do you have any good ideas to give me ? What about you ? What  you did you do lately ? Do you still work at your dad's shop after school ? You know what ? I have just had a great idea!