Read the following sentence from the story “The Best investment I ever Made”.No sooner had the sergeant banged the door than he saw the doctor hurriedly coming down.Which event happened first? banging the door.What was the second event? the coming of the doctor.Did the second event happen immediately or after some time? Immediately after.How have we linked the two events?By using no sooner…. than.Note: When the second event occurs immediately after the first, they can be connected with “No sooner …. than”. “No sooner” should be added to the event that occurred first. ‘Had’ or ‘did’ is used along with ‘No sooner’.Read the following sentences and complete them suitably:1. No sooner had I reached the station than the train left.No sooner did I reach the station than the train left.2. No sooner had we heard the sound than we rushed to the spot.No sooner did ________3. No sooner had _______No sooner did she finish the project than she started a new one.4. ____ I received her call ___I left the house.__________