Choose the correct alternative of the verb given in brackets. Ramesh _________ (be) a teacher since 1994.

Correct option is B) 

The present perfect tense is used to suggest an action which started in the beyond and is continuing now. It is frequently used along with 'since or 'for' to suggest the time. It is made of elements: (1) the proper form of the auxiliary verb, 'to have' (in present tense) (2) the past participle of the primary verb. In the given sentence the words, 'since 1994' is used. This means that Ramesh was a teacher in the past since 1994 and is still continuing to be one. Hence its present perfect form is to be used. As Ramesh is a singular noun (0.33 person), the proper form of the auxiliary verb, 'to have' is: has. The primary verb is 'be', whose past participle form is 'been'. Hence, 'has been' as given in option C is correct. Option A is wrong as it is in simple present tense. Option C is wrong as it is in present continuous tense. Option D is wrong as it is simple past tense.