Correcting faulty Parallesim sentences.

1.The professors test were long,difficult,and produced anxiety.

2.Medical tests showed that neither being allergic to dust nor seasonal hay fever caused the child’s coughing fits.

3.The hair stylist warned her customers ,”I’m a beautician,not a magician.This is a comb;it’s not a wand.”

I'll fix the first one. Then you try the other two, OK?

The professor's tests were long, difficult, and anxiety-ridden.
The original had two adjectives and one predicate in the series. All the items in a series need to be the same part of speech or grammatical construction.
http://grammar.ccc.commnet.edu/grammar/parallelism.htm

Now you try the other two, and I'll check them for you.

1. The professors' tests were long, difficult, and anxiety-inducing.

2. Medical tests showed that neither dust allergies nor seasonal hay fever caused the child's coughing fits.
3. The hair stylist warned her customers, "I'm a beautician, not a magician. This is a comb, not a wand."

To correct the faulty parallelism in the given sentences, we need to ensure that the corresponding elements in each series or list have the same grammatical structure. Here's how we can fix them:

1. The professors' tests were long, difficult, and anxiety-inducing.
Explanation: Here, we changed "test" to "tests" to match the plural subject. We also changed "produced anxiety" to "anxiety-inducing" to make the structure consistent.

2. Medical tests showed that the child's coughing fits were not caused by either dust allergies or seasonal hay fever.
Explanation: Here, we changed "being allergic to dust" to "dust allergies" to make the structure parallel. We also added "were not caused by" to clarify the cause and effect relationship.

3. The hair stylist warned her customers, "I'm a beautician, not a magician. This is a comb, not a wand."
Explanation: In this sentence, the parallelism is fixed. The stylist compares herself to a magician and a comb to a wand using consistent sentence structure.

Remember, parallelism is about maintaining parallel structure with the same grammatical forms for corresponding elements in a sentence or series.