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.
What are the signs and symptoms of an anxiety attack? The symptoms felt during an anxiety attack can feel like symptoms of a serious health problem, such as a heart problem. On the other hand, some serious health problems can cause anxiety attacks, such as heart or breathing problems.