xiaonvhai123 Wrote:Hi, instructors:
In Manhattan SC guild, chapter 10 odds&ends, there is a session about "comma":
Do not use a comma before AND to separate two verbs that have the same subject. Either eliminate the comma or add a subject to the second verb, creating a second main clause.
EX:Earl walked to school, AND later ate his lunch (wrong)
Earl walked to school, AND he ate his lunch (correct)
However, in the correct answer, there is no subject in the second part, but there is a "comma+AND" structure.
Given the correct answer should be always correct, would you like to give an explanation on this point? thanks alot...really feel confused...
Okay let me try to explain a bit, I am not expert but I will give it a shot.
A scrub jay can remember when it cached a particular piece of food in a particular place, researchers have discovered, and tends not to bother recovering a perishable treat if stored long enough to have rotted.
Here in the above sentence the two commas (red bold) go together and sets of modifier (researchers have discovered) separate from the sentence. Hence, here the construction is not Comma + And as you have said, but sentence is saying 'scrub jay' can do to things as follows;
A scrub jay
can remember when it cached a particular piece of food in a particular place
And
tends not to bother recovering a perishable treat if stored long enough to have rotted.
You can think about parallelism at work in this sentence.
In the examples you have given above,
Earl walked to school, AND later ate his lunch (wrong)
is wrong because we are trying to connect two clauses, which are not independent, with Comma + And. Because this sentence is missing Subject in the second part.
Earl walked to school, AND
he ate his lunch (correct)
is correct because now, we have added Subject in the second part.
You can also make this sentence correct by removing Comma, constructing it in the sense of parallelism. i.e. as follows;
Earl walked to school and later ate his lunch.
here 'walked' and 'ate' are parallel.
I Can. I Will.