4. Inversion should be done in the statement if the sentence is introduced by an adverb. Example :
Hardly I had reached the station when the train arrived. (incorrect)
Hardly had I reached the station when the train arrived. (correct)
5. ‘A large number of’/ “A number of” should be followed by a plural verb. Example :
A large number of students was absent. (incorrect)
A large number of students were absent. (correct)
6. “The large number of”/ “The large number of” should be followed by a singular verb.. Example :
The number of aspirants have not appeared in the examination.(incorrect)
The number of aspirants has not appeared in the examination.(correct)