The research paper investigates the role of the Parliamentary opposition in the constitutional amendments adopted during PPP's government (2018-2013). The role of the classic or loyal opposition is that it offers different alternatives against government policies. It not only opposes the government policies but also maintained political competition by forwarding its own policies. It does not make any obstruction in the way of the government, however, presented its own alternatives in the constitutional limit. Therefore, the opposition during PPP's government was also classic or loyal opposition. It did not make hurdles for the government to pass these constitutional amendments, nonetheless, presented its own alternatives and amendments in eighteenth, nineteenth and twentieth constitutional amendment bills. Almost, all the opposition parties have participated in the debate in the National Assembly as well as Senate, and have presented their amendments and suggestions in these constitutional amendments.