Answer :`
1. I/study/ International Secondary School.
⇒ I am study in International Secondary School.
2. I/grade six/and/ I/ class 6A.
⇒ I am in grade six and I am in class 6A
3. Three/building/and/a swimming pool/my school.
`⇒There are three building and a swimming pool in my school.
`4. My class/first floor/building A.
`⇒My class is the first floor in building A.
`5 My/favorite subject/Vietnamese/Maths.
`⇒ My favorite subject is Vietnamese and Maths.
`6. Mr.Quang/my favorite teacher./He teach/History.
`⇒Mr.Quang is my favorite teacher. He teaches History.
`7.I/not like/History/I/think/it/a boring subject.
`⇒ I don't like History because I think it's a boring subject.
`8. I/not/usually/read/books/the library/break time.
`⇒I don't usually read books in the library in break time .
`~Go od luck !~`