IV. Underline the gerund and determine its tense (Indefinite/Perfect) and voice (Active/Passive) form. Translate the sentences into Russian.
1. The documents need being checked.
2. We are interested in buying these goods.
3. We could not effect payment due to no signature being affixed thereto.
4. We would appreciate your considering the matter urgently.
5. We would prefer having been informed by e-mail.