Duolingo Guidebook

我刚才给你发了电子邮件。
I just sent you an email.

我会给你发照片。
I will send you photos.

我其实还没有看你的短信。
I actually still have not read your text message.

过去三天为什么你不回我的电话？
Why did you not call me back in the past three days?

这里没有信号。
There is no signal here.

我们谈了很多事情。
We discussed a lot of things.

Here’s another example of a character that changes tone based on the word it’s in.

发

头发
(tóufa) hair

发现
(fāxiàn) realize

发短信
(fā duǎnxìn) send (a message)