Mi aĉetis kvar pomojn po du pencoj = I bought four apples at the rate of twopence (each).
Por miaj kvarinfanoj mi aĉetis dek du pomojn = For my four children I bought twelve apples.
Unu prenis tri kaj la alia prenis kvar el la pomoj = One took three and the other took four of the apples.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "kvar" in a variety of sentences. We hope that you will now be able to make sentences using this word.