Question

the telephone started ringing just after he had left the house... starting sentences is.mmmno sooner....

Answer 1

no sooner the telephone started ringing, he had left the house

Answer 2

Answer:

No sooner had he left the house than the telephone started ringing.

Explanation:

ok.. They have  said to begin with "no sooner"..

The condition is ..if no sooner comes add them along with "than"

                  NO SOONER ...THAN