When I have finished vs when I finish

[Johnyxxx]

Hello,

No Shiel today ...

I have found a sentece which is:

"When I have finished my work, I will have a beer."

I would like to ask why present perfect simple is used in the sentence while it evidently refers to an event in future. I know it means the same thing like "When I finish my work, I will have a beer" so it seems strange to me why have and -ed are used here.

Thanks a lot

 

[Matthew Wai]

I think there is real difference below, but I am not a teacher.

'When I do my work, I will have a beer.'── I will have a beer while doing my work.
'When I have done my work, I will have a beer.'── I will have a beer after doing my work.

 

[Tdol]

Try getting that real difference with finish, which is what Piscean was asked. Also, I would probably use While I do my work to get that meaning. In most cases there is little difference between the two forms- the present perfect just adds an extra element of completion.

 

[Matthew Wai]

"When I finish my work, I will have a beer"

I think it might suggest that a beer is near at hand, otherwise the speaker cannot have it right at the moment of completion, but I am not a teacher.

 

[Tdol]

I think it might suggest that a beer is near at hand, otherwise the speaker cannot have it right at the moment of completion, but I am not a teacher.

It doesn't have to be right at the moment of completion, but is possibly the next major thing that they do. What matters is that the work must be finished first.