Anyway. There's a context, with a question and two possible answers. For each possible answer there are two possible forms. I'm interested in which of those possibilities are good/possible/preferred/optimal for you.
Please let me know if you're a native English speaker and (roughly) which variant of English you speak. If you're not native, please note your native language. This isn't actually directly thesis-related; I'm just curious.
A worker approaches his boss and asks, "Can I have my wages now?" The boss replies either
1.a I will not pay you your wages before you finish the entire job.
1.b I will not pay you your wages before you have finished the entire job.
2.a I will pay you your wages after you finish the entire job.
2.b I will pay you your wages after you have finished the entire job.
Oh, and if you wouldn't use these possibilities, please specify which of the two in each case you find less "difficult". And then, should you feel that your right to free speech has somehow been violated by the previous sentence, add what you'd ideally say.
And for bonus points (and quite frankly, because I'm curious), if you can recreate the situation in your language and give a parallel judgement, please be my guest!