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.
(in-depth info on anxiety attacks starts here) Typically, anxiety symptoms can fit into one of two categories: physical symptoms and emotional symptoms. Physical symptoms of anxiety include physical reactions to the stress that others could notice. Emotional anxiety symptoms would include reactions to stress or a challenging situation that people on the outside usually cannot detect.