不可数名词（没有复数形式）
bread,rice,water,juice,milk,tea,coffee…
缩写形式
I'm=I am you're=you are she's=she is
he's=he is hasn't=he has（got）
it's=it is who's=who is can't=can not
isn't=is not didn't=did not let's=let us
weren't=were not wasn't=was not
a,an.the的用法
1.单词的第一读音是辅音读音：
a book,a peach,a‘U’单词的第一个读音是元音，读音：an egg,an hour,an‘F’
2.the要注意的：球类前面不能加the,play football乐器前面要加he,play the piano序数词前面要加the,the second
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