"I have been working on this problem since 9:00 AM" and "I have been working on this problem for 2 hours" are both correct.
Type: Posts; User: translationsnmru; Keyword(s):
"I have been working on this problem since 9:00 AM" and "I have been working on this problem for 2 hours" are both correct.
My versions, subject to correction by native speakers :)
1) I'd say, "so that he won't..." or "so that he doesn't have to..."
2) "so that he will/can correct them."
3) "so that he...
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