Present perfect tense

[Ju]

1. Please drink some juice as soon as you complete the race.
2. Please drink some juice as soon as you have completed the race.

May I ask whether the above sentences are the same in meaning?

A. She's going to study after she finishes dinner.
B. She's going to study after she has finished dinner.

May I ask whether the above sentences are the same in meaning?

 

[Charlie Bernstein]

Yes, they have the same meanings.

 

[jutfrank]

Generally speaking, no two different sentences are exactly the same in meaning. Otherwise, there wouldn't be a need to have two different sentences in the first place. The difference in meaning here is that which is effected by the difference in aspect—the first uses the present simple and the second uses the present perfect.

Having said that, both sentences in each pair express the same basic idea. The sequence of events is the same.

 

[tedmc]

Another variant with the same meaning is:
She is going to study after finishing dinner.

 

[Tdol]

The present perfect can be used to emphasise completion. Here, they seem pretty much the same.