2.
Playing 2/1 GF with 1NT = 15-17 hcp
1. Do you open 1NT?
YES = 4432, nice jacks in combination
NO = Some hands have to be downgraded...
If the answer above is "no", then if the auction continues...
1C - (Pass) - 1D - (Pass), your rebid is:
1S - Got four of them
1NT - show balanced
If the answer to open 1NT was no, then the auction continues....
1C - (pass) - 1NT - (Pass) your rebid is:
2NT - I do I have 15 hcp, we vul, this is imps
Pass
1D - 1S
1N - 3C
4C - 4D
5C - ?
Partner can't have much. At most in minors QJ, QJ. That 6 points. If partner had something like AKJ, KQJ, AQJ of hearts, surely he would bid 3NT over 3C. With heart ACE, you reasonably assume partner would cue-bid 4H on the way to 5C. So partners hearts are at most KQxx or KJxx (no 3NT bid). So it seems likely he "must" have an ace. Do you bid 6S? Do you pass? Do you correct to 5D or 5S? Do you bid 5NT. It took me quite a while to bid here.

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Playing 2/1 GF with 1NT = 15-17 hcp
1. Do you open 1NT?
YES = 4432, nice jacks in combination
NO = Some hands have to be downgraded...
If the answer above is "no", then if the auction continues...
1C - (Pass) - 1D - (Pass), your rebid is:
1S - Got four of them
1NT - show balanced
If the answer to open 1NT was no, then the auction continues....
1C - (pass) - 1NT - (Pass) your rebid is:
2NT - I do I have 15 hcp, we vul, this is imps
Pass