Question

you (sleep) when i entered the room​

Answer 1

Answer:

if u have a question than complete it and if u r do time pass here so stop it

Explanation:

Answer 2

The correct sentence will be

You had slept when I entered the room.

In these types of sentences, two incidents take place simultaneously.

So, for the incident which had already taken place we will use past perfect tense in the sentence formation.

We will use simple past tense for the incident which took place later.