急急急急//////////////

例子he reads a book 點解reads要加s?

Golden rule of grammar: (第三生, 單數, 現在式 = 動詞加 .. s ..)
1/ Third person
2/ Singlar number
3/ Present tense
Verb has to add ...s...

he reads books (all the time)

If an adjective(read) meets a subject(he) , the adjective(read) must be put a "s", changing as "reads"
ie) The subject must be he or she or it.

因為他 是三身單數, 所以動詞要+ S

2007-07-10 22:42:52 補充：
HE/ SHE/ IT ALSO S IN VERBSi/ WE/YOU/THEY NO NEED S