初中英语需要掌握的英语语法有很多，没办法意义总结出来，下面总结下几个常用的英语语法：
(1) “数词+复数名词作主词，虽为复数形，但强调单一性，则用单数动词。若强调一个一个的个别数，则用复数动词。
Thirty minutes is sufficient for a good sermon.
Fifty dollars a month is a large sum in our eyes, but is nothing to him.
cf. Ten years have passed since I saw you last.
(2) 数词+名词+形容词=形容词
a six-year-old boy
a three-hundred-year-old tree
注：上述的复合字是以hyphen(-)连结，而且其中的名词要用单数形式。
(3) 名词(无冠词)+基数=the +序数+名词
World War Ⅱ= World War Two or the Second World War
Vol. Ⅰ= Volume One or the First Volume
Page 4 = page four or the fourth page;
Lesson 6 = lesson Six or the Sixth Lesson;
Chap. Ⅲ = Chapter Three or the Third Chapter;
Charles Ⅰ= Charles the First;
cf. Napoleon the Great = the Great Napoleon;
(这几种用法，非专有名词，可不用大写，但等号两边须一致。〕
(4) 数词+名词=形容词
a five-dollar bill;
two three-hour periods;
the Three-power Conference(三强会议);