Объедините два предложения в одно не меняет части местами используется Before
Например: I sent a telegram.Then i met my friend
I had sent a telegram before i met my friend.
Предложения
1) The rain stopped.I went for a walk.
2) I did my homework.My mother returned home.
3) We met in the street.We went to the park.
4) They packed their things.Then they started.
5) I had dinner. I switched on the TV set.

1 The rain had stopped before I went for a walk.2 I had done my homework before my mother returned home.3 We had met in the street before we went to the park.4 They had packed their things before they started.5 I had had dinner before I switched on the TV set.или I had switched on the TV set before I had dinner.