The present study was conducted to find out the effect of reconstruction activities on grade XI students' English writing skills which included mechanical accuracy I (punctuations) and mechanical accuracy II (spellings). The study was carried out employing a pre-test post-test experimental control group design. A government degree college for boys from district Lahore was selected conveniently for intervention. Sixty students of grade XI were randomized into two equal groups. Students of the experimental group were taught for sixteen weeks continuously. Students' English writing skills were measured through a supply-type English writing skills test. Data were analyzed through paired and independent samples t-tests. Results revealed that reconstruction activities had a statistically significant effect on students' English writing skills. English teachers of grade XI are recommended to practice reconstruction activities for teaching and developing students' English writing skills (punctuations and spellings). Students are recommended to experience reconstruction activities to develop their English writing skills: Punctuations and spellings.