Have not yet occured
Depends on the date, year, time.
Geologic Time Scale
In England and America, September 3, 1752, never happened. Actually, September 3rd through the 14th never happened. Up until that time, the countries were using the Julian calendar, which calculates the time between the vernal equinox as 365.25 days. But in 1752 a decree was made in Britain that the Gregorian calendar was going to be adopted. The length of a year in the Gregorian calendar, which was introduced in 1582 by Pope Gregory XIII, is 11 minutes shorter than the Julian calendar. To make up for the time difference between the two calendars and get back in step meant having to "lose" 11 days. The announcement of the change caused riots on both sides of the Atlantic; people thought the government had stolen 11 days of their lives.
Wood
Nothing. Absolutely nothing has happened!
It is questionable due to the fact that there is no official timeline of Fraser Island.
Oxygen is believed not to be present at the time of Earth's formation.
Anything that happened before you read this (basically anything that happened before the present time)
Up until major human development in the last 300 years, the reef grew both laterally and vertically from almost nothing in the last 1 million years. Human development has caused a shrinking of the reef due to pollution.
"Then and now" is a phrase that compares the past with the present, highlighting differences or similarities between two time periods. It is often used to reflect on how things have changed or remained the same over time.
went
A writer would not use the present tense when describing something which happened some time previously.
The Starving Time
The present is a moment in time discernible as intermediate between past and future
Use the past simple to ask about a specific time or event that happened in the past, such as "When did you go to the store?" Use the present perfect to ask about an action that happened at an unspecified time or has relevance to the present, such as "Have you ever been to Paris?"
"It has come" is correct. "Has come" is the present perfect tense, which is used to talk about something that happened at an unspecified time in the past and has relevance to the present. "Came" is the simple past tense, which is used for actions that happened at a specific time in the past.