1) i couldn't play football because 2) when i went back to the shop 3) helen was upset yesterday because 4) we got to the theatre after 5) i didn't wait for you because 6) when i arrived at the airport a) i hadn't read your text message b) the plane had just landed c) i hadn't brought my boots d) the play had started e) they's sold all the cheap trainers f) i hadn't remembered her birthday

I couldn't play football because I hadn't brought my boots.
 
When I went back to the shop they'd sold all the cheap trainers.

 Helen was upset yesterday because I hadn't remembered her birthday .
 
We got to the theatre after the play had started.

I didn't wait for you because I hadn't read your text message.

When I arrived at the airport the plane had just landed.