Analyze and comment on the following.He has been sick since this fall.Tell what "sick" and "fall" mean respectively and explain why they take on those meanings in modern American English.
（1）"SICK" MEANS "ILL" AND "FALL" MEANS "AUTUMN" IN PRESENT AMERICAN ENGLISH;
（2）THESE WORDS NO LONGER HAVE SUCH MEANINGS IN PRESENT BRITISH ENGLISH;
（3）AMERICAN ENGLISH HAS REVIVED THE OLD MEANING OF "SICK" AND THAT OF "FALL". THIS IS THE REVIVAL OF ARCHAIC OR OBSOLETE WORDS.
