401. Once...

Introduce an event or action that happened at an unspecified time.

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402. One day...

Introduce a particular event that happened one day.

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403. At first...

Describe what happened before a later event or change.

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404. In the beginning...

Introduce the early stage of a story or situation.

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405. To begin with...

Introduce the first step or event in a sequence.

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406. After that...

Introduce an event that happened after a previous event.

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407. Then...

Introduce the next event in a sequence.

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408. Next...

Introduce the next step or event.

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409. Meanwhile...

Describe an event that happened while another event was taking place.

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410. At the same time...

Describe two events or actions happening at the same time.

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