x hours a day
fixed phr..fixed phr.. You use this phrase to say how many hours something happens each day. 'X' is a number.
fixed phr.. A fixed grammatical frame used to quantify the duration of an activity, occurring daily. The 'X' is a variable representing a number.
I work eight hours a day.
To stay healthy, doctors recommend that you sleep at least seven hours a day.
The contract stipulated that the junior developers were not to work more than ten hours a day, even during critical project phases.
The 'X' can be any number, and 'a day' can often be replaced with 'per day'.
Teach this as a productive frame: 'X [unit] a [period]', such as 'three times a week' or 'two coffees a day'.
I work eight hour a day.I work eight hours a day.When the number 'X' is more than one, the unit 'hour' must be plural.