I. TENSES
Exercise 1. Use Present Simple - Active or Passive.
1. A provisional denture (to use ) for a short period of time for reasons of esthetics, function, or occlusial support.
2. Most patients (not to prepare) to function without teeth, even for a short time.
3. The mouth (to contain) a number of different tissues, some of which, such as mucous membrane, connective tissue, blood vessels, nerves, muscle, and bone, (to find) throughout the body.
4. Foods (to differ) in their ability to stimulate salivary flow which, in turn, can influence their intra-oral effect.
5. The properties of an organism responsible for its pathogenicity (to call) virulence factors.
Exercise 2. Use Past Simple - Active or Passive.
1. The remaining teeth (to extract) and the fixed partial dentures (to remove).
2. Protein and vitamin levels (to exceed) the minimal recommended level.
3. Calculus deposits carefully (to remove ) from the selected teeth with a hand scaler.
4. The marginal fit of each crown (to examine) on the tooth.
5. A light-cured resin (to use) to fix each tooth.
Exercise 3. Use Future Simple - Active or Passive.
1. The odor of necrosis (to detect) usually even before the pulp chamber is opened because dentin becomes saturated with by-products of protein denaturation.
2. If caries is not managed preventively, the restorative treatment (to doom) to a cycle of disease, repair, new disease and further repair, and before too long, extraction.
3. Undermined enamel is brittle and in due course (to fracture) if subjected to occlusal forces, producing a large cavity.
4. The state of the tissue at any time (to depend) on the balance between the attacking forces and the defence reactions.
5. In many cases removing the adjacent tooth (to improve) access for cleaning, and even relatively large enamel lesions partially (to remineralize).