1.There is some water on the floor.（are-is,water不可数）
2.He likes to tell stories after school.（like-likes,he为第三人称,加s）
3.There are some students in the classroom.（is-are,students复数）
4.I’m friendly with my classmates.（短语friendly with,友好）
5.He is doing his homework now.（is doing,现在进行时）
10.This is the first e-mail from your new e-pal.（因为是new新的邮箱,所以是第一封邮件）