陳述句
(1)肯定句：是指用肯定的語氣來陳述的`句子，如：
I’m a student.
She is a doctor.
He works in a hospital.
There are four fans in our classroom.
He will eat lunch at 12:00.
I watched TV yesterday evening.
(2)、否定句：含有否定詞或表示否定意義詞的句子，如：
I’m not a student.
She is not (isn’t) a doctor.
He does not (doesn’t) work in a hospital.
There are not (aren’t) four fans in our classroom.
He will not (won’t) eat lunch at 12:00.
I did not (didn’t) watch TV yesterday evening.
