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 attacks can occur causing intense feelings of fear, dread, heart palpitations, shortness of breath, trembling, and sweating. You may also show symptoms of violence, irritation, agitation and nervousness. You may also give in to unusual fits of weeping for no apparent reason.