It is important to cite information from a source when you need to prove to the reader what your saying is true.
I'm sorry, but I do not understand your question. Please try to re-explain it.
I don’t think that there are any worst languages. There are are hard languages like mandarin. The most spoken are english, mandarin and Hindi. The easiest are Spanish, french and Italian.
Introduces an opposing view, then refutes it logically and respectfully is correct
Conjugate 'to frighten, to terrify, <span>who alarmed. </span>