一、be动词的用法be动词有三种变形, 分别是: am, is, are。
记忆口诀:“我”用am, “你”用are, is用于“他、她、它”；单数全都用is, 复数全部都用are。
二、人称与人称代词的不同形式（主格和宾格）1.三种人称: 第一人称（I, we）, 第二人称（you, you）, 第三人称（he, she, it, Maria）。
2.人称代词的主格, 即人称代词位于句子主语位置时的形态：I, We, You, You, He, She, It, Maria。
3.人称代词的宾格, 即人称代词位于句子宾语位置时的形态：me, us, you, you, him, her, it。
4.形容词性物主代词: my, our, your, your, his, her, its, their。
5、名词性物主代词: mine, ours, yours, yours, his, hers, its, theirs。
6.反身代词: myself, ourselves, yourself, yourselves, himself, herself, itself, themselves。
三、基数词（表示数量多少的词, 大致相当于代数里的自然数）zero, one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty-one, twenty-two,twenty-three,twenty-four, twenty-five, twenty-six, twenty-seven, twenty-eight, twenty-nine, thirty, forty, fifty,sixty,seventy, eighty, ninety, one hundred,one hundred and one。
