Hello.

I apologize for bothering you with similar questions but I'm supposed to explain the difference in tenses in the following English sentences taken from the original English press. Will you help me please? The context is absolutely the same, but the tenses are different:
1)President Obama will speak on Libya tonight at 7:30. (emphasis on a fact, he will start speaking at this time, right?)
2)President Obama will be speaking on Libya tonight at 7:30. ( emphasis on a planned and expected action?)
3)President Obama is speaking on Libya tonight at 7:30 (again, a planned action which is to take place soon?)
4)President Obama speaks on Libya tonight at 7:30 (emphasis on a timetable?)
I will really appreciate your answer. Thank you very much for help.

Frankly, I don't find any difference in meaning, no matter which of the 4 tenses you use.

Of course! I'd be happy to help explain the difference in tenses in the given English sentences.

1) President Obama will speak on Libya tonight at 7:30. This sentence is written in the future simple tense. It indicates a future event that is scheduled to happen. The emphasis here is on the fact that President Obama has plans to speak on Libya at the mentioned time.

2) President Obama will be speaking on Libya tonight at 7:30. This sentence is written in the future continuous tense. It also refers to a future event, but with an emphasis on the ongoing nature of the action. The use of the continuous tense suggests that the speaking event is expected to last for a period of time and may involve some form of prepared speech or presentation.

3) President Obama is speaking on Libya tonight at 7:30. This sentence is written in the present continuous tense. It indicates a planned action that is going to occur in the very near future. The use of the present continuous tense suggests that preparations have already been made for the speaking event and it is about to take place.

4) President Obama speaks on Libya tonight at 7:30. This sentence is written in the present simple tense. It indicates a scheduled event that occurs regularly or as part of a timetable. The emphasis here is on the regularity or fixed nature of the speaking event.

In summary, the different tenses in these sentences convey slightly different nuances regarding the timing and nature of the planned speaking event. The choice of tense provides additional information about whether the action is a singular event, ongoing, or part of a regular schedule.