1£®He didn’t realize the love we have for our families is important until he went through real hardship.

→Not until he went through real hardship did_he_realize_the_love_we_have_for_our_families_is_important£®

2£®Hearing the dog barking fiercely, the thief fled away.

→Hearing the dog barking fiercely, away_fled_the_thief£®

3£®He was hurt so seriously in the accident that he was sent to hospital at once.

→So_seriously_was_he_hurt in the accident that he was sent to hospital at once.

4£®They had no sooner sat down than the boss started shouting at them.

→No sooner had_they_sat_down_than the boss started shouting at them.

5£®Her business was so successful that Jane was able to retire at the age of 50.

→So successful_was_her_business that Jane was able to retire at the age of 50.

6£®We laugh at jokes, but we seldom think about how they work.

→We laugh at jokes, but seldom do_we_think_about_how_they_work£®