used to indicate a period of time during which an action takes place or a state of affairs exists, often denoting simultaneous or concurrent events
used to denote a continuous period of time starting from a particular event or point in the past and continuing until the present or a specified time
used to express that something happens at the same time or right after another thing
used to describe a duration or period of time during which something happens or continues to be true
used to describe a duration or period of time during which something happens or continues to be true
used to indicate a point in time before which an action or event has occurred or will occur
used to emphasize the present moment in relation to the topic under discussion
used to express the idea of something happening or being done at the appropriate or necessary times
used to indicate simultaneous action to show that one action or situation occurs at the same time as another
used to indicate that if certain conditions or situations occur, certain actions or responses will follow