This document outlines the structure of sentences in the present perfect tense in English. It provides the formulas and examples for positive sentences using "have/has + past participle", negative sentences using "have/has + not + past participle", and interrogative sentences using "have/has + subject + past participle". The examples demonstrate how to form sentences in the present perfect tense based on the subject being I, you, he, she, we, or they.

1. PRESENT PERFECT TENSE
POSITIVE SENTENCE
FORMULA:
Subject + Have/Has +
Verb 3.
Example:
1. I have taught English
2.You have taught
English
3.He has taught English
4.She has taught
English
NEGATIVE SENTENCE
FORMULA:
Subject + Have/has +
NOT + Verb 3
Example:
1. I have not taught
English
2. We haven't taught
English
3.He hasn't taught
English
4.She hasn't taught
English
INTEROGATIVE
SENTENSE
FORMULA:
Have/has + subject +
Verb 3
Example:
1.Have I taught English?
2.Has he taught
English?
3.Has she taught
English?