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It looks like you correctly identified a Stop Sign of the x of y subject type: The Great Wall Street Crash of 1929 is indeed the subject of the sentence.[[snippet]]
However, you did not notice another type of Stop Sign in the sentence. Well done for identifying the x of y subject Stop Sign, but keep looking for another type!
The subject of this sentence is The Great Wall Street Crash. This phrase appears at the beginning of the sentence, well before the verb was preceded. Therefore, the verb precedes subject Stop Sign is not the type of Stop Sign that appears in this sentence. Look again.
Congratulations on identifying the long complex subject/long distance between subject and verb Stop Sign. Unfortunately, you missed another type of Stop Sign that appears in this sentence. Look again.
You correctly noticed two types of Stop Signs in the sentence. Note that the x of y subject Stop Sign type occurs in the subject of the sentence - The Great Wall Street Crash of 1929. The other stop sign you identified was the long distance between subject and verb Stop Sign, as the verb was appears at a great distance from the subject, only after the long intervening phrase: an event that affected the lives of millions of Americans and had immediate repercussions in the international finance centers of that time.[[snippet]]
Which Stop Sign(s) do you identify in the following sentence?
The Great Wall Street Crash of 1929, an event that affected the lives of millions of Americans and had immediate repercussions in the international finance centers of that time, was preceded by a period of severe instability in the stock markets.
The following question will help you learn how to identify Subject Verb Agreement Stop Signs, which are indications of possible errors. To keep things simple, the sentence presented in the question stem does not contain an error, so don't look for one.