What is the correct way to punctuate the sentence? Ivan handed me a stale bun ___ which was too hard to eat ___ so I joked that we use it as a hockey puck instead.

Ivan handed me a stale bun, which was too hard to eat. So I joked that we use it as a hockey puck instead.

Explanation:

The sentence above was punctuated with a comma and a period.

The comma was used to separate the sentence adverb from the rest of the sentence. This is because whenever a word or a sentence indicates a "way" of something, a comma is used and the characteristic of the old bread, presented a "way", a way of modifying the noun "bread", so a comma should be used. Soon after, a period was used to indicate that one thought was concluded and another thought would be started.

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.

he will find out what went wrong or happened and how.