I forgot to include the following sentences. I really hope you can have a look at them, too.

1) But I heard his voice, which sounded very low.
I couldn't see his face because he escaped very quickly.
2) The only thing I remember is that is was carrying something like a gun in his right hand.
3) I felt sorry for my best friend because his girlfriend had dumped him.
4) I was proud of myself (not me) when I got a good mark in my maths test (I made a good grade on my maths test, both possible?):
5) I was ashamed of myself when my teacher reprimanded me in the class register for using my mobile phone during a test.

1) However, I heard his voice, which sounded very low.

2) The only thing I remember is that he was carrying something like a gun in his right hand.

3) OK

4) I was proud of myself when I got a good mark in my maths test. (I made a good grade on my maths test, both possible?) Both are correct, yes.

5) OK

2. "is that is was carrying " = is that he was carrying

4. on my math test is more usual

5. in the class register? or simply "in the class"

Sra

No problem, here's an analysis of each sentence:

1) But I heard his voice, which sounded very low.
To analyze this sentence, you can break it down into two parts:
- "But I heard his voice" indicates that the speaker was able to hear the person's voice.
- "which sounded very low" provides additional information about the voice, indicating that it was a low tone.

2) The only thing I remember is that is was carrying something like a gun in his right hand.
To analyze this sentence, let's break it down:
- "The only thing I remember" indicates that the speaker can only recall one specific detail.
- "is that is was carrying something like a gun in his right hand" describes the detail the speaker remembers, which is that the person was holding an object resembling a gun in their right hand.

3) I felt sorry for my best friend because his girlfriend had dumped him.
To analyze this sentence:
- "I felt sorry for my best friend" indicates the speaker's emotion towards their best friend.
- "because his girlfriend had dumped him" provides the reason for feeling sorry, as the friend's girlfriend ended their relationship.

4) I was proud of myself when I got a good mark in my maths test (I made a good grade on my maths test, both possible?).
To analyze this sentence:
- "I was proud of myself" describes the speaker's feeling of pride.
- "when I got a good mark in my maths test" specifies the achievement that made the speaker proud, which is receiving a good grade on their math test. "I made a good grade on my math test" is also possible and has the same meaning.

5) I was ashamed of myself when my teacher reprimanded me in the class register for using my mobile phone during a test.
To analyze this sentence:
- "I was ashamed of myself" describes the speaker's feeling of embarrassment or guilt.
- "when my teacher reprimanded me in the class register" explains the reason for feeling ashamed, which is the teacher scolding the speaker in front of others in the class register.
- "for using my mobile phone during a test" specifies the action that led to the reprimand, which is using a mobile phone during a test.