The past influences the present what has been lost can be regained.
Answer:
The next train <u>is</u> at exactly 3 o'clock this afternoon.
It's a nonessential word, clause, or sentence added to an already grammatically complete sentence. It's most commonly set off by brackets, but it can also be set off by commas or dashes.
Example:
My mother went to the supermarket and picked up some strawberries (my favorite fruit) earlier today.
Severe Drought
Africa has been known to have terrible droughts which have led to famines and wars.
