Past tense

The past tense is a grammatical tense whose principal function is to place an action or situation in past time. In languages which have a past tense, it thus provides a grammatical means of indicating that the event being referred to took place in the past. Examples of verbs in the past tense include the English verbs sang, went and was.

In some languages, the grammatical expression of past tense is combined with the expression of other categories such as mood and aspect (see tense–aspect–mood). Thus a language may have several types of past tense form, their use depending on what aspectual or other additional information is to be encoded. French, for example, has a compound past (passé composé) for expressing completed events, an imperfect for expressing events which were ongoing or repeated in the past, as well as several other past forms.

Some languages that grammaticalise for past tense do so by inflecting the verb, while others do so periphrastically using auxiliary verbs, also known as "verbal operators" (and some do both, as in the example of French given above). Not all languages grammaticalise verbs for past tense – Mandarin Chinese, for example, mainly uses lexical means (words like "yesterday" or "last week") to indicate that something took place in the past, although use can also be made of the tense/aspect markers le and guo.

Past Tense (disambiguation)

The past tense is a verb tense expressing action, activity, state or being in the past.

Past Tense may also refer to:

Past Tense (Star Trek: Deep Space Nine)

"Past Tense" is a two-part episode from the third season of science fiction television series Star Trek: Deep Space Nine, the 57th and 58th episodes overall.

The crew of the Defiant is thrown back in time to 2024 on Earth. The United States of America has attempted to solve the problem of homelessness by erecting "Sanctuary Districts" where unemployed and/or mentally ill persons are placed in makeshift ghettos.

Plot

Part I

When Commander Sisko, Dr. Bashir, and Jadzia Dax attempt to beam down to Earth from the Defiant, an accident occurs and they materialize in San Francisco in the year 2024.

Dax is separated from her crewmates. Offered help by a prominent businessman, Chris Brynner, she manages to get an ID, money, and a place to live.

Meanwhile, Sisko and Bashir are awakened by a pair of police officers, who believe them to be vagrants and warn them to get off the streets. They are escorted to a "Sanctuary District", a fenced-off ghetto that is used to contain the poor, the sick, the mentally disabled, and anyone else who cannot support themselves. Sisko sees the date on the calendar and realizes they have arrived just days before the "Bell Riots", a violent confrontation in the San Francisco Sanctuary District, that Sisko recalls as a watershed moment in human history. Dozens will be killed, including a man named Gabriel Bell, the leader of the demonstration. Bell will become a hero because of his self-sacrifice while protecting hostages. As a result of Bell's heroism, attitudes toward the disadvantaged begin to change. Unable to find a building to sleep in, Sisko and Bashir live in the street.