Which of the following is correct? We hire our bicycle... by the hour. by hours. by an hour. for hours.
When talking about time as a unit, which one is correct, in second or in seconds? For example: How long does it take to complete the task in second? or How long does it take to complete the ...
I have found some statements using the format years instead of year. When do we use years like 1950s and 2010s, rather than year like 1950 and 2010? Fish stocks here began to decline in the 1950s, ...