It wasn't necessary for Emma to book her train ticket so far in advance because there were plenty of seats available. BOOKED Emma..... her ticket so far in advance because there were plenty of seats available.
needn't have booked
Unfortunately, I didn't have enough money to go travelling with my friends. WOULD If I'd had more money, I..... travelling with my friends.
WOULD HAVE BEEN ABLE TO GO
Lucy was sorry she hadn't applied for the course in time. REGRETTED Lucy....for the course in time.
regretted not applying/ (that) she hadn't applied
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