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  Active Passive
Indefinite Writing Being written
Perfect Having written Having been written

 

(Indefinite) , , , - ( ):

 

I am surprised at seeing this. .

I intend going there. .

 

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Swimming is a healthy exercise. .

 

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I know of this having gone to the North. , .

 

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Splitting the atom is a difficult task. . .

 

Transformers are used for changing d.c. into a.c. . , .

 

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His having obtained a residue at such a temperature was a great success. , .

 

They knew about our having done it. , .

 

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Their aim was collecting all the necessary data. , .

The fly-wheel began moving. .

 

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Many solids have the power of absorbing gases on their surfaces. ( ) .

 

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After closing the circuit we measured the resistance. , . . , , .

 

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The liquid evaporated without leaving a residue. , .

 

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I heard of his coming

 

 

I heard of him coming.

 

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The liquid dissolving no more substance is the proof of its saturation. , , .

 

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The liquid dissolving no more substance is called a saturated liquid. , , .

 

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