1.There are many students in our class.
= Many students are in our class.
= Our class has many students.
= I have many classmates in our class.
2.There is( a book ) on the chair.括号里提问
= What is (there) on the chair?
注：此句中的there可以省略不写.
3.There are some pens (in the pencil case).括号里提问
= Where are some pens?