will and before...

[Saneta]

Which sentence is correct:

1. a) They will come in two years. (I mean:in two years= after two years) or
b) They will have come in two years.

The above sentences we can say also in another way, but which is correct?:

2. a) It will pass by/go by two years before they come. or
b) It will have passed/gone by two years before they come.
c) It wil pass by /go by two years before they have come. or
d) It will have passed/gone by two years before they have come.

Thank you very much for help! :)

[Takashiro]

Hi, Saneta!
As with Q1, I prefer Sentence (a). We usually say "They will have come by the end of....<sometime in the future>......". "will have come" emphasizes something will be finished sometime in the future. It seems unnecessary when "in two years" is used.
By the way, I think "in two years" is equal to "two years later" instead of "after 2 years". "after 2 years" is often used in past tense.

Q2 is puzzling me as well. I'm sorry I can't be of more help. ;-)

[Beeesneees]

Question1 (a)

Question2 needs further rewording:
"Two years will pass before they come."
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