How do you use then at the beginning of a sentence?

You can use "then" at the beginning of a sentence to indicate a sequence of events, actions, or thoughts. It suggests that what follows happened or will happen after something else.

Here are some examples:

* Then, the doorbell rang. (This implies that something else happened before the doorbell rang.)

* Then, she decided to go for a walk. (This suggests that she made a decision after something else.)

* Then, I realized I had forgotten my keys. (This implies that the realization happened after something else.)

However, "then" is often considered informal when used at the beginning of a sentence. In formal writing, it is generally preferred to use a more sophisticated conjunction or phrase to introduce the next event or action.

Here are some alternatives to using "then" at the beginning of a sentence:

* After that,

* Subsequently,

* Following this,

* Therefore,

* Consequently,

For example:

* After that, the doorbell rang.

* Subsequently, she decided to go for a walk.

* Following this, I realized I had forgotten my keys.

Ultimately, the choice of whether to use "then" at the beginning of a sentence depends on the context and the desired tone.