Why is Present Continuous used after when/if/what clauses, if the Present Simple tense is preferable in the sentences with general meaning after if, when they refer to future/present?
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Best Answer
The present continuous emphasizes
action in real time
.For example, an announcement is made repeatedly over the train-station loud speaker:
A passenger waiting in the station could turn to another and ask:
What is he saying?
P.S.
The implication is that speaker and listener are in a situation where this announcement might be made yet another time. The present continuous refers to it as something which is ongoing or repeating.
If the speaker believed that the announcement is not likely to be made again, or is perceiving the announcement as something that took place a moment ago, the question would probably be:
In this particular contextual example, the question would not be asked in the simple present:
unless it referred to a specific place in the announcement:
The answer could be, respectively:
The simple present there would refer to the phrase that follows "due to" in the announcement as one that occurs with some predictability or regularity: he says it in the same way each time he says it.
The continuous would refer to the phrase that follows "due to" in the announcement as one that we are hearing him say again and again.
P.P.S.
Even if the announcement comes over the loud-speaker once:
a person might turn to a fellow passenger, even as the announcement is continuing, and ask:
The announcement is in progress.