the dog和the dogs都不表示一类,而分别表示:这/那只狗;这些/那些狗.表示一类是the加形容词,如:the poor:穷人;the blind:盲人泛指时是不加the的,如:Dogs are our best friend.是的.单数名词动词用单数形式,即加s或es;复数名词动词用复数形式,即动词原形,如:The dog comes out for a walk with his maste...