Theme is not something that can be copyrighted, so no it is not plagiarism. If you copied the words or characters it would be plagiarism.
It can be a verb: "I alerted the authorities." It can be an adjective: "Alerted authorities are more effective than uninformed authorities."
Yes, you are alerted if a question on your watchlist is flagged.
The past tense of alert is alerted.
to be alerted
they are not alerted, but if they go to their friends list it will say "you are no longer friends with this person."
When one of your questions is ed, you are alerted by email if you were logged in as a contributor when you asked that question.
alerted notified
It can be a verb: "I alerted the authorities." It can be an adjective: "Alerted authorities are more effective than uninformed authorities."
nope
Alerted people to the Samoan Tsunami
These forces are capable of rapid deployment but are not yet alerted to dploy (AC) or alerted for mobilization (RC).
because they have secret spy looking out.