1. the woman's job is to order books because she is library assistant
2. because eduardi's exam is tomorrow, he is studying
3. last week we did the experiment but it failed
4. although spain can get very hot in the summer, it is a popular tourist destination
S1+V1 because S2+V2
although S1+V1, S2+v2
S1+V1 but S2+V2