The time in English has two forms:
Both forms use the word o'clock when the minutes are zero. For example:
In the minutes past/to hour form we use a quarter for fifteen minutes and half for thirty minutes. For example:
If the minutes are not 0, 5, 10, 15, 20, 25 or 30, we use often include the word minutes. For example:

What's the time of the clock in the picture.
You do not need to put a full stop as the answer already includes a full stop.
It's __________.
a quarter past eight
It's __________.
six o'clock
It's __________.
twelve minutes to eight
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