QUESTION: Fix punctuation: Heres just a few of the great things you can do with Skype for iPhone
ANS: Here's just a few of the great things you can do with Skype for iPhone:

QUESTION: Fix punctuation: It is even more a regret
ANS: It is even more a regret.

QUESTION: Fix punctuation: 18 Nutmeg proves antidepressant activity
ANS: 18. Nutmeg proves antidepressant activity.

QUESTION: Fix punctuation: Cut the bananas into slices if they werent already sliced when frozen and remove the stones from the avocado and the dates
ANS:
Cut the bananas into slices (if they weren't already sliced when frozen) and remove the stones from the avocado and the dates.