They don't know where they will go this Sunday.(改为简单句)They don't know ___ ___ ___ this Sunday.

They don't know where they will go this Sunday.(改为简单句)
They don't know ___ ___ ___ this Sunday.

where to go

They don't know ( where to go ) this Sunday
他们不知道这个周日去哪儿
望采纳！祝开心！