Why do we use the Present Perfect Tense?.Rules to be followed while using Present Perfect Tense.Present Perfect Tense Formula-Based Sentences Formation Structure.NCERT Solutions Class 10 Social Science.NCERT Solutions For Statistics Class 11.NCERT Solutions Class 11 Chemistry Updated 2023-24.NCERT Solutions Class 12 Maths Updated 2023-24.NCERT Solutions Class 12 Chemistry Updated 2024.