421. The reason is...

State the cause or explanation for something.

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422. That's because...

Explain the cause of a situation or result.

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423. That's why...

Explain the reason for a result or situation.

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424. The problem is...

State the main difficulty or issue.

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425. The solution is...

State the answer or method for dealing with a problem.

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426. The point is...

State the main idea or important point.

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427. The fact is...

Emphasize an important fact.

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428. The good thing is...

Introduce a positive aspect of a situation.

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429. The bad thing is...

Introduce a negative aspect of a situation.

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430. The best part is...

Introduce the most positive or useful part of a situation.

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