: ★ There is tremendous progress in the field of medicine.➛ There has been tremendous progress in the field of medicine.✫ The given sentence is in Simple Present Tense and we have to change it to Present Perfect Tense. Sentence Structure of Simple Present Tense :- ➺ Subject + Verb + Complement.Sentence Structure of Present Perfect Tense :- ➺ Subject + Have/Has + Past Participle form of Verb + Complement.★ The man DIED before the doctor arrived. ➛ The man had died before the doctor arrived. ✫ The given sentence is in Simple Past Tense and we have to change it to Past Perfect Tense.Sentence Structure of Simple Past Tense :- ➺ Subject + Past form of Verb + Complement.Sentence Structure of Past Perfect Tense :- ➺ Subject + Had + Past Participle form of Verb + Complement.KNOW MORE : ❖ What is Tense ?➲ In grammar, the term "Tense" can be DEFINED as a category through with the time reference is expressed. It is a verb-based method of expressing or indicating time of an action.➲ There are mainly THREE Tenses in English Grammer :- [1] Present Tense[2] Past Tense[3] Future Tense ❖ What is Present Tense ?➲ The tense which express or indicate the present time is known as Present Tense. A verb that refers to present time is said to be in the Present Tense.➲ There are FOUR types of Present Tenses :- ➺ Simple Present Tense➺ Present Continuous Tense➺ Present Perfect Tense➺ Present Perfect Continuous Tense ❖ What is Past Tense ?➲ The tense which express or indicate the past time is known as Past Tense. A verb that refers to past time is said to be in the Past Tense.➲ There are four types of Past Tenses :- ➺ Simple Past Tense➺ Past Continuous Tense➺ Past Perfect Tense➺ Past Perfect Continuous Tense ❖ What is Future Tense ?➲ The tense which express or indicate the future time is known as Future Tense. A verb that refers to future time is said to be in the Future Tense.➲ There are four types of Future Tenses :- ➺ Simple Future Tense➺ Future Continuous Tense➺ Future Perfect Tense➺ Future Perfect Continuous Tense