Hello there. I am not good at Japanese, so please verify my answers with everyone else's.

なんとなくmeans 'somewhat' or 'a bit'. This is used when referring to something with an unexplainable extent/gravity.

なんとなくげんきです - I am a bit well/ I am somewhat well.

だろう means 'probably' or 'perhaps'.

かれはびょういんにいくだろう - He will probably go to the hospital.

じゃなくて means 'not ___, but ___'.

みどりじゃなくて、あおいです - not green, but blue.

 

Hope, this one helped you even a bit.

romulus is correct. or you can simply say "please stop" or "please do not continue".

Notice for Tourists Going to Pudong Airport Every tourist to enter Shanghai city will be asked for checking because of the World Exposition 2010 in Shanghai from April 15 to November 15, 2010. Please make sure you bring your passports or identity cards with you when you buy tickets to Pudong Airport in Hangzhou Tourist Center. Each tourist will be given a ticket with his/her name on it. Children will also be asked to show their passports and register. Once you get your tickets, please verify the information in it, especially your name and the number of your passport and/or identity card. Please bring your tickets and passports/identity cards with you when taking the bus to Pudong Airport.

not really tongue-twisting..

Yes, "I wonder where John is these days" is correct.

i don't know if this works for you but try looking out for sentences/lines/conversations which use that word. that way, you'll be able to know the meaning of the word in the context. or you can associate the word with something already familiar to you.

she wants me to pick her up.