This research aimed at exploring the grammatical errors of undergraduate students in writing English language. English is an international and global language and is widely taught and learnt in Pakistan as second language. With reference to all the language skills in English, writing is considered most important. The whole focus of educational process is the writing skills of the learners as assessment is mostly written based. In order to conduct the current research, students from college level were selected randomly to participate in the process of data collection. After assortment of information about blunders in composed English through a survey was investigated which submitted by the understudies and afterward information was examined through MS Excel and SPSS. The outcomes uncovered that right off the bat, all undergrad level understudies of Pakistan are capable enough in making mistakes while composing English. Also, there are no measurably huge contrasts among open and private college understudies of Pakistan. Thirdly there is likewise no measurably huge contrast among male and female understudies of Pakistan.