Is it correct? Thanks.
How were these windows broken? Could I say how these windows were broken?
Why was the letter was sent to him? Could I say Why the letter was sent to him?
Thanks.

Question

Answer

How did these windows break? and second one can't really be changed.

Answer

No, you'd need to say how were these windows broken, and how was it sent to him. It is incorrect said the other way.

Answer

how these windows were broken is a question... or a possible statement.
not to be used in a regular sentence.

your first sentence is correct

Answer

Thanks a lot, Ezer, how these windows were broken also could be correct, right?

Answer

The first setence you state How were these windows broken? Is the correct way to say it of the two sentences if you are asking a question. The second statement is correct if you are trying to explain to someone how the windows became broken. E.I. These windows were broken, because........

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