Your question about still seems to be more about the meaning of the word, than any kind of grammar, since you don't understand the meaning of the word.
The steps to asking a good meaning question:
- Look up your word in a dictionary.
- Take time to understand what the dictionary entry is telling you.
- If there are still things you don't understand, ask your question including:
- explaining what research you have done
- explaining why this doesn't answer your question
- clearly ask about the thing you don't understand, including context as necessary.
- Come up with a good title for your question, something that is specific to your problem.
- Tag appropriately
Your other questions is just a list of sentences and the question "Which, if any, are correct?" For one, proof reading is off topic (see the FAQ), for another you don't explain why any should be correct or incorrect.
Your questions demonstrate that you are still learning English. That's great, we're all still learning to some degree. But you seem to be towards the beginning end of the learning spectrum, whereas questions on this site should come from people who already know the language quite well. We're not here to teach people English. This is why there is a proposal for an English language learner's Stack Exchange, to complement this site and allow people a place to ask questions that are too basic for here.