| serious problem | 109.94 | We are faced with a serious problem. | ||
| economic problem | 92.10 | The US faces severe economic problems. | ||
| major problem | 85.71 | Pollution is a major problem. | ||
| financial problem | 65.57 | Our financial problems are over. | ||
| biggest problem | 57.60 | Bears are the biggest problem. | ||
| technical problem | 47.93 | All the technical problems. | ||
| only problem | 47.33 | Food is not the only problem. | ||
| big problem | 47.00 | Big problem. | ||
| potential problem | 46.94 | Are there other potential problem. | ||
| real problem | 46.15 | All real problems. | ||
| similar problem | 42.86 | Academics have similar problems. | ||
| same problem | 38.18 | But the same problems. | ||
| back problem | 36.01 | Back problems tormented him. | ||
| medical problem | 35.55 | But his medical problems were not over. | ||
| social problem | 33.18 | A social problem. . . . | ||
| main problem | 32.46 | Birds are the main problem. | ||
| mechanical problem | 31.34 | Mechanical problems? | ||
| political problem | 27.39 | But he has a political problem. | ||
| respiratory problem | 25.35 | Half the traffic cops have respiratory problems. | ||
| legal problem | 24.42 | She has a lot of legal problems. |