The first sentence. When you're talking about more than one elf it is elves not elfs.
The science of mental health an uncertain cognitive State
Hello!
<span>To repeal all national penal provisions which constitute discrimination against women.
Good Lessons. =)
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The word 'be' is the verb. For the future you can put the word "to" in front of a word to check if it is a verb, in this case it is 'to be'