[Grammar] Why is the subject omitted in this adverbial clause?

[registered]

My teacher told us we can omit the clause's subject, when it consists with the main clause's subject.

Does my GPA matter when applying for a job?

my GPA is the main clause's subject, but the adverbial clause omit I am.
In this sentence, the subject in the clause doesn't consists with the subject in the main clause.How can "I am" be omit?

 

[MikeNewYork]

Your sentence is correct. It would also be correct with "I am" added. The subject does not have to be the same.

 

[konungursvia]

I saw a cow riding my bicycle through the countryside the other day.

 

[registered]

I saw a cow riding my bicycle through the countryside the other day.

It's not the same case.riding my bicycle is the object complement describing the cow.

 

[registered]

Your sentence is correct. It would also be correct with "I am" added. The subject does not have to be the same.

Could you please give me some more examples?

 

[Matthew Wai]

'I usually stay indoors while raining.'

 

[MikeNewYork]

That sentence doesn't work, Matthew.

 

[emsr2d2]

'I usually stay indoors while raining.'

That suggests that you are raining!

I usually stay indoors while reading.
I usually stay indoors when it rains.
I usually stay indoors during rain.

 

[konungursvia]

I think that was the point, Matthew seems to be doing what I did: providing a sentence that illustrates the issue of slight to moderate to severe changes in subject with multiple clauses -- meaning "this sort of practice can really be problematic, see?"

 

[Matthew Wai]

It's not the same case.riding my bicycle is the object complement describing the cow.

Do you really think that a cow can ride a bicycle?

 

[registered]

Of course not! I think we are discussing the grammar problem.

 

[registered]

That suggests that you are raining!

I usually stay indoors while reading.
I usually stay indoors when it rains.
I usually stay indoors during rain.

Is this sentence right? "Does my GPA matter when applying for a job? "

 

[registered]

Do you really think that a cow can ride a bicycle?

Of course not! I think we are discussing the grammar problem.

 

[Raymott]

Is this sentence right? "Does my GPA matter when applying for a job? "

It's grammatical. I don't like it though.
I think the meaning you're after is, "Does one's GPA matter when one is applying for a job?" or "Does your GPA matter when you're applying for a job?" Here the "your" means "one's", ie. it's non-specific.
The original is a very unnatural sentence. I really don't think many people would say it. I would say (if this is what I meant), "Does my GPA matter when I'm applying for a job?" It depends on how clearly you want to speak.

 

[Tarheel]

Is this sentence right? "Does my GPA matter when applying for a job? "

I think you should keep "I am" in that sentence. That way you wouldn't have to explain what you mean.

 

[tkacka15]

I saw a cow riding my bicycle through the countryside the other day.

"riding my bicycle through the countryside the other day" is a hanging participle and not placed near "I", the subject of the main clause which is "I saw a cow" thus failing to make the sentence clear. It should rather be like that: "When riding my bicycle through the countryside the other day, I saw a cow."

 

[Matthew Wai]

"When riding my bicycle through the countryside the other day, I saw a cow."

I think 'When' can be omitted above.

That suggests that you are raining!

If so, the OP's sentence suggests that the GPA is applying for a job.

riding my bicycle is the object complement describing the cow.

It is possible in an animated cartoon.

 

[tkacka15]

I think 'When' can be omitted.

Yes.