介绍他人的时候经常用 This is …
This is Miss Sophie Dupont.
Sophie is a new student.
She is French.
a, an 是不定冠词
用于：1、可数名字单数前面 2、具有不确定意义的事或名词前面
This is a watch
a 用在普通名词前面， an 用于元音音素（元音发音的单词）前面
a pen an apple an umbrella an egg an hour a university
the 是定冠词，表示特指
Look, look, a man is coming into the classroom.
The man is my teacher.
and 用在句首表示转折
too 一般用于肯定句中
选择疑问句的标志词是 or
Is she a French student or an English student?
选择疑问句的回答必须要用完整的句子回答
Is he a worker or a teacher?
He isn't a worker, he's a teacher.
