Can we shop online？
Let’s take it online.
How much is it online？
It’s ...yuan online.
What do children do online？
Both players are online.
Go to the website today and you can unsubscribe online.
I like chatting online.
The site acts as a portal for thousands of online dealers.
Now he buys his own tickets online.
Shopping online is easy and fun.
It’s easy to find information online.
We can do many things online.
Many people prefer to shop online.
Online learning is becoming more popular.
这些句子涵盖了不同的语境和用法，适合四年级学生学习和使用。建议学生们在实际交流中多加练习，以巩固所学知识。