I'm cooking dinner this evening VS I'll be cooking dinner this evening

[hirashin]

Dear native English speakers,
What's the difference between the sentences below?
(a) I'm cooking dinner this evening.
(b) I'll be cooking dinner this evening.
(c) I'm going to cook dinner this evening.

Thanks in advance.
Hirashin

 

[OoTmaster]

Just verb tense. (b) and (c) are future tense, (b) is a prediction/statement of fact while (c) is intention.

English Grammar Explanations - Future tenses

(a) is present continuous. If it is already evening it something you are doing at the moment and it is ongoing i.e. you are currently making dinner. You can use the continuous present for actions you haven't started but have been arranged i.e. you have arranged to make dinner this evening and it is not yet evening.

English Grammar Explanations - Present Continuous

 

[hirashin]

"Why don't we go on a picnic tomorrow?"
(a)”Sorry, I'm learning English all day tomorrow."
(b)"Sorry, I'll be learning English all day tomorrow."
(c)"Sorry, I'm going to learn English all day tomorrow."

Which answer would be appropriate?
　

 

[OoTmaster]

All are appropriate for that context.

 

[hirashin]

Thanks, OoTmaster.