Key Grammatical Phrases including 对，再说，还，要不然，还。。。呢，没有。。。那么， 一。。。就 in Sentence Usage
These sentences look like exactly the ones I hear from people around me and the ones I would use to speak to them, and most important of all, no misunderstanding caused.  There might be minor rhetoric modification but nothing grammatical.  If there is any grammatical flaw, maybe all of us should go back to Grammar 101.