In the following sentences, insert the missing commas. Some commas have already been inserted, however, all sentences have one or more commas that are still missing.

1. I heard very clearly when the chair next to me moved but my eyes stayed carefully focused on the pattern I was drawing.

I heard very clearly when the chair next to me moved, but my eyes stayed carefully focused on the pattern I was drawing.

1. I heard very clearly when the chair next to me moved, but my eyes stayed carefully focused on the pattern I was drawing.

To insert the missing commas in the given sentence, you need to identify the places where commas should be used to separate clauses or to indicate a pause.

Corrected sentence with inserted commas: I heard very clearly when the chair next to me moved, but my eyes stayed carefully focused on the pattern I was drawing.

Explanation of comma placement:
- The first comma is inserted after "moved" to separate the dependent clause ("when the chair next to me moved") from the main clause ("I heard very clearly").
- The second comma is inserted after "drawing" to separate the two main clauses ("my eyes stayed carefully focused" and "on the pattern I was drawing"). This comma is necessary because the sentence has a coordinating conjunction ("but") joining two independent clauses.