Sugar is uncountable; therefore, the sentence has a singular verb. Marbles are countable; therefore, the sentence has a plural verb. 3. Compound subjects joined by and are always plural. 4. With compound subjects joined by or/nor, the verb agrees with the subject nearer to it.
Panic disorder causes panic attacks spontaneous feelings of anxiety, terror, or impending doom. Physical symptoms include heart palpitations, chest pain, and shortness of breath. These attacks may be repeated at any time. People with any type of anxiety disorder may have panic attacks.
Anxiety can produce many unusual and distressing physical sensations. In some cases, these sensations are merely irritating. In other cases, these sensations can actually cause a great deal of stress. One of the symptoms of anxiety caught somewhere in between is muscle spasms. Muscle spasms can be irritating to some, incredibly distressing to others, and are a common symptom of anxiety that can be both severe and mild depending on the person.