| Prepositions showing time and place | hackergenlc_ch20_1.html | 574ad3ca757a2ebd04000000 |
| DLAP questions | hackergenlc_ch20_1_dlap.xml | 574ad3ca757a2ebd04000000 |
| Common adjective + preposition combinations | hackergenlc_ch20_2.html | 574ad3ca757a2ebd04000000 |
| DLAP questions | hackergenlc_ch20_2_dlap.xml | 574ad3ca757a2ebd04000000 |
| Common verb + preposition combinations | hackergenlc_ch20_3.html | 574ad3ca757a2ebd04000000 |
| DLAP questions | hackergenlc_ch20_3_dlap.xml | 574ad3ca757a2ebd04000000 |