Réponse :
a.I had bought my ticket to New York (1) before I discovered you were going too (2).
b.My parents bought a coffee shop (2) after theyd owned a pizza restaurant for 10 years. (1)
c.Our friends had already eaten (1) when we arrived. (2.)
d.We had already bought our barbecue (1) before we sent the invitations. (2)
e.I remember you already knew all the songs on the new album (1) before I had heard it (2)
Explications :