1.   Since they started borrowing money, their problems have multiplied.

2.   Hefti said that when she filed her complaint, her problems multiplied.

3.   His problems will multiply exponentially if Russian troops take Grozny, the capital.

4.   Labor leaders fear that the corruption problems could soon multiply if federal investigators conclude that Carey participated in the illegal fund raising and he is indicted.

5.   On space missions, the potential problems multiply because of increased radiation that can cause the fungi to mutate into more dangerous forms.

6.   The problems multiply when oil prices fall.

7.   The problem multiplied.

8.   Since then, the problems have multiplied.