英語語法：關(guān)于冠詞的問題
有些名詞用定冠詞修飾,有些則沒有,從意思上我覺得差不多啊,這我覺得搞不懂.就是在類指和泛指搞不清楚
例：
1.Attracting senior citizens,Florida is home to the largest population of elder Americans.
"Attracting senior citizens"這之中問什么不能在senior citizens前加“the”,我覺得在指"senior citizens"這一類人,有何不可?
2.Using illegal drugs can lead to health problems,and it an be a stain on one's life.
"Using illegal drugs "中“illegal drugs ”前加"the"解釋為“那類違法的藥品”為什么不行?
3.The car goes faster than the bike.為什么這里“car”和“bike”前要加“the”呢?如果把“car”和“bike”變?yōu)椤癱ars”和“bikes”那還要不要加“the“嗎?前兩個例子中“the”和他們都是復(fù)數(shù)有關(guān)嗎