Phân biệt hai câu sau

phân biệt giúp mình 2 cái trên
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You can use the present continuous with today/ this week/this year etc. (periods around now):
OA: You're working hard today. (not You work hard today)
B: Yes, I have a lot to do.
The company I work for isn't doing so well this year.
In the same way we use the present perfect with today, this evening, this year etc. when these
periods are not finished at the time of speaking:
today
O I've drunk four cups of coffee today.
Have you had a holiday this year?
I haven't seen Tom this morning. Have you?
past
now