Verified answer

Then cut them into cubes

或是再簡短一點就說cut into cubes

cube是指正立方體的

切成片狀才用piece

應該不用加with a knife

因為要切成丁狀也只能用刀切

所以加with a knife有點太多餘了

Then uses them the knife to sliver a scrap scrap

希望有幫到妳!

可以用slice

奇摩字典有：

把...切成薄片[(+up)]

She sliced the onion and put it in the beef stew.

她將洋蔥切片放入燉牛肉中。

所以，您的句子

然後將他們用刀切成一小塊一小塊

Then, slice them in pieces with the knife.