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.
The physical symptoms of anxiety during a panic attack can be severe and include a thumping heart (palpitations), trembling, feeling short of breath, chest pains, feeling faint, numbness, or pins and needles. Each panic attack usually lasts 5-10 minutes, but sometimes they come in waves for up to two hours.