What is the suffix in the word extensive? what does it tell you about the meaning of the word?

Which sentence uses the verbs correctly?

Who can translate this tá an-deacair ag an ngaeilge

Which of the following is an assertive statement? whatever you want to do is fine by me. i see your point, but i still think the other solution is more effective. well, that may not be the best idea, but we could try it. that will never work. just think about it.