11, It was not until his father threatened to punish him that the boy told the truth.

Not until his father threatened to punish him did the boy tell the truth.

12, It was not until she received that new treatment that the patient's heart condition improved.

Not until she received that new treatment did the patient's heart condition improve.

13, It was not until he felt too tired that he didnt stop working.

Not until he felt too tired did he stop working.

14, It was not until they had some proof that the police could make any accusations.

Not until the police could make any accusations did they have some proof.

15, It was not until the last visitor left that the little girl wasnt allowed to open the gifts.

Not until the last visitor left was the little girl allowed to open the gifts.

16, It was not until he was forty that he got married.

Not until he was forty did he get married.

17, It was not until he went to HCM city that he hadnt been a famous singer.

Not until he went to HCM city had he been a famous singer.

18, It was not until 1980 that she began to learn English.

Not until 1980 did she begin to learn English.

19, It was not until we began primary school that we studied English.

Not until we began primary school did we study English.

20, It was not until last year that I was taken to the zoo.

Not until last year was I taken to the zoo.