Often, in language use, deciding whether to use the present perfect or the past simple depends on your perspective on the event. Two people were killed when the bomb went off but the effect of ...

The clauses above bear examples of a common verb tense: the present perfect continuous. This is the tense that indicates an action ...

We use the present perfect when we are considering something that started in the past and which we want to connect with the present. It may be something that started in the recent past ...