in which

[allthewayanime]

I know that preposition usually get to the end of the sentences, but what about 'in which' ?
Normally you'd see something like ' the box in which I put my ball' however could I rephrase as ' the box which I put my ball in' ? Also questions like ' in what year are we?' could I change them in ' what year are we in?'

[Rover_KE]

Yes to both questions.

[emsr2d2]

I know that prepositions usually can get to go at the end of a sentence, but what about 'in which'?

Normally you'd see something like "The box in which I put my ball". However, could I rephrase it as "The box which I put my ball in"? Also, with questions like "In what year are we?", could I change them in to "What year are we in?"

Rover has answered your question. I would like to draw your attention to the amendments I have made to your post.

Be careful with your spacing around punctuation.
Remember to put a capital letter at the beginning of a sentence held within quotation marks. Note that this is not necessary when you are only posting a single word or a short phrase which does not constitute a sentence.