Re: Dear Professor!!!
Welcome to Using English.
You will find we will always ask you to make your best effort to answer a question yourself first. While "Stretching" may be tricky, other words in your sentences are clearly only one part of speech, so you should be able to answer some.
So try to answer this yourself first and then we'll help you with the others.
PS - We are not professors here, or at least, very few are.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.