① Would you please let me know when we get there?
“我们到达那里的时候,你能告诉我吗”
“Would you please let me know ”是主句,“when we get there”是时间状语从句.
② Please let me know when you will receive those parts and can ship to us.
请告知我你们什么时候将收到这些零件并用船运给我们?
“when you will receive those parts and can ship to us.”作为know的宾语从句.