Time adverbial clause: usage of as

1. As soon as something happens, another thing happens immediately

As the sun rose the frog dispersed.

The fog dissipates as soon as the sun comes out.

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They strolled into the garden as the music ceased.

As soon as the music stopped, they strolled into the garden.

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2. In the process of something happening, something else happened

I heard the murmur of their voices as I crossed the hall.

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I heard them muttering something as I walked through the hall.

(Both actions are in simple tense)

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Just as he was speaking there was a loud explosion.

While he was speaking, there was a loud noise.

(The clause is in progressive tense)

3. Two actions occur at the same time

He smiled as he passed.

He passed by Laughed a little while.

(Both are short actions)

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As she sang, the tears ran down her cheeks.

Her While singing, tears streamed down my cheeks.

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Helen heard the story as she washed.

Helen heard the story as she washed.

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He saw that she was smiling as she read.

He saw that she was smiling as she read.

He saw that she was smiling as she read.

(Both are continuous actions)

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We get wiser as we get older.

We follow Become wiser with age.

(Changes over time)