Refer the following to the past. Make all the necessary changes.

Refer the following to the past. Make all the necessary changes. 1. It is getting pretty late. I must leave, or I shall be late for the last bus. 2. This is getting too far, I feel I must do something before it is too late. 3. It can39;t go on like this any longer. It must blow up sooner or later. 4. I know it39;s a secret and I must keep it, 5. He is trying to explain why the measures he proposes must be resorted to if we want to save the situation. 6. He does not understand why such urgent measures as have been taken must be resorted to even in the face of the situation. 7. It is impossible to change anything. One must take things as they are. 8. I do not agree with him that one must always take things as they are without trying to change them. 9. Do you realize that you mustn39;t mention it to anybody?