1
In the last day of my holiday, I finally found my passport.
On the last day of my holiday, I finally found my passport.
I can’t come at that day.
I can’t come on that day.
Use on before a specific day or date: ‘on a cold day’, ‘on 25 June’, ‘on Saturday’.
2
She slept all the day.
She slept all day.
We have been cooking for all the day.
We have been cooking all day.
I haven’t seen him in all day.
I haven’t seen him all day.
Use all day, all week and all year without the or a preposition.
We can also say all day long or the whole day: ‘We have been cooking all day long.’ ‘My dad slept for the whole day.’
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3
In these days some people have to work more hours for less money.
These days some people have to work more hours for less money.
Use these days, without in, to talk about the present time, often in comparison with the past: ‘Sixty is not considered old these days.’
Use in those days to talk about a period in the past: ‘Sixty was considered old in those days.’