An embedded question is contained within a statement or a question. The important thing here is word order:
1. I don't know where the library is.
The first two examples show an embedded question. The word order is subject and then verb.
Question |
Embedded Question |

What does this taste like? |
I don't know what it tastes like.
Do you know what it tastes like? |

Where did you buy this cake? |
I can't remember where I bought it. |

Where did they move to? |
I have no idea where they moved to.
Does anyone know where they moved to? |

Why do leaves change color in the fall. |
I don't know why they change colors.
Is there a website that can explain why leaves change color in the fall? |

How long has she been gone on her trip. |
I'm not sure how long she's been gone.
Does anyone know how long she's been gone? |

How much did you pay for those shoes? |
I'm not sure how much I paid for them.
Does the receipt show how much I paid for them? |
|
When did she learn how to ride a tricycle? |
I can't remember when she learned.
Do you think she remembers when she learned to do that? |