A student I tutor wrote the following:
"I will keep myself as active as possible and challenge many things for another six months left."
I told the student that she should either delete the "left" or add a relative clause like "that I still have left." I couldn't figure out though why "left" cannot be used at the end of the sentence here, when it can be used sentence-final in "I have another six months left."
I asked a university professor and she came up with the following:
1. "I will live here for another six months." prepositional phrase
2. "I have another six months (that are) left." reduced relative clause
3. "I will be active for another six months."
4. "*I will be active for another six months left." postmodified noun
5. "I will be active for the six months (that are) left."
My problem has to do with sentences 2 and 4. Why is 2. grammatical when 4. isn't? In oder for 4. to be grammatical, I need to add a definite article to the postmodified noun but that doesn't seem to hold for 2. We thought that maybe it has something to do with the verbs (have vs. be active) but we simply couldn't figure out what was going on here.

Any ideas??
Thanks,
Angelika.
