Natural wetlands are lands which, due to geological or ecological factors, have a natural supply of watereither from tidal flows, flooding rivers, connections with groundwater, or because they are perched above aquifers or potholes.
Realize that many verbs can be both transitive and intransitive. An action verb with a direct object is transitive while an action verb with no direct object is intransitive. Some verbs, such as arrive, go, lie, sneeze, sit, and die, are always intransitive; it is impossible for a direct object to follow.
Answers. We make the Present Perfect tense with the correct form of the auxiliary verb have (have/has) and the third form (past participle) of the mail verb. To form the past participle of the regular verbs, we add ed to the infinitive. Examples: I have worked as a secretary for two years. Present Continuous Tense when to use; how to form; ing forms of the verbs; English action and state verbs; the difference between the Present Continuous and the Present Simple tenses; test. 2  The verb to be-the Present Simple Tense. 3  Grammar reference and online exercises for Elementary level.