Maasai tribes have been hunting lions as trophies for hundred of years, emphasizes the duration of an action, i.e., How long?, Since the 1940s, numbers have decreased dramatically, to around 20,000 today., emphasizes the present result of the action, i.e., How many? / How much? / How often?, Preparations for the next Games have been heating up, and everyone involved is getting excited., emphasizes the fact that an action is incomplete., The coaches in each manyatta have already chosen their athletes for the team., emphasizes the fact that an action is complete., Have the games been a successful way to help conservation efforts in Kenya and Tanzanya?, is used with stative verbs, e.g., want, know, believe, be.

Present perfect and continuous

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