Between formal and colloquial English there is unmarked English. It is neither so literary and serious as formal English, nor so casual and free as colloquial English. (which)

She asked her boyfriend “Is it true that your father fought in the last war?”

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Please continue doing your work and don’t let anything interrupt you.

      Please                                                        and don’t let anything interrupt you.

It is reported that the building has been badly damaged by the fire.

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I’ll consider it carefully and give you an answer next week.

      I’ll                                                              and give you an answer next week.

He said “I don’t understand why she has refused to join us on the trip”

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“Don’t be so silly” Mr. John said to his wife.

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It is expected that the weather will be good tomorrow.

      →      

It is alleged that the man was driving at 110 miles an hour.

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People consider that she was the best singer that Australia has ever produced.

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You’d better put your money in the bank, Jack.

 I advised________________________________________________________________