Uses of When and While in Past Continuous

1. I was cooking dinner _____ the phone rang.

when

while

since

2. _____ I was studying, my friends were playing football.

when

while

since

3. I was sleeping _____ my mom arrived.

while

when

during

4. Which sentence is correct?

While I was watched TV, my brother came.

While I was watching TV, my brother was doing homework.

When I watching TV, my brother came.

5. When I was walking to school, it started to rain. → What is the use of "when"?

It introduces a longer action.

It introduces a shorter action that interrupts another.

It means the same as "while".