The answer is "could have forgotten" since you is the subject, you wouldn't include that in the verb phrase.
Concrete nouns are ones made up of atom.
Dog,cat,table sat,wink
Answer:
12. Further obstacles cannot definitely <em><u>break</u></em> out, but it’s our obligation to carry-on with the investigation until it’s complete.
13. There are rumors that the ministers have tried to <em><u>cover</u></em> up the news of the recent affair so as not to lose face with the public.
<h2> I am not sure but it might help.</h2>
