Mr. Shafiqul Islam has taught us about the basic form of English grammar. He is a well-known teacher. Everyone loves him very much for his teaching technics. He has been continuing his profession for twenty-five years.

Sentence 1 : Here, the predicate is ' has taught' which is present perfect tense . 'Mr. Shafiqul Islam' is subject and 'Us' represents object. The subject is 3rd person so that I have to use the auxiliary verb 'has'.

Sentence 2: 'He' is pronoun antecedent of Mr. Shafiqul Islam. This is a simple present tense.

Sentence 3: 'Everyone' is a singular pronoun which represents 'us'. This is a simple present tense because the main verb is in present form and the subject is 3rd person. So the main verb 'love' is added with an extra 's'.