Can you use the word after in beginning of a sentence?

Yes, you can use the word "after" at the beginning of a sentence. It's common to use it to introduce a time-related clause. Here are some examples:

* After the rain stopped, the sun came out.

* After graduating, she went on to work for a non-profit organization.

* After you finish your homework, you can go outside and play.

However, starting a sentence with "after" can sometimes feel a bit formal or awkward, depending on the context. It's often preferable to use a different word or phrase to introduce the sentence, such as:

* When the rain stopped, the sun came out.

* Following her graduation, she went on to work for a non-profit organization.

* Once you finish your homework, you can go outside and play.

Ultimately, whether or not it's grammatically correct to start a sentence with "after" depends on the specific sentence and the desired style.