This is Miss Sophie Dupont.
介绍他人的时候经常用This is…
3个冠词
a，an是不定冠词，一个
用于：1、可数名词单数前面 2、具有不确定意义事或名词前面
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 this is Naoko.
and用在句首表示转折
She's Chinese, too.
too一般用于肯定句中
either也，用于否定句中
