15.1. James was unaware of his girlfriend’s plans for Christmas.
SLIGHTEST
James ___________________________ his girlfriend’s plans for Christmas.
James didn't have the slightest idea of his girlfriend's plans for Christmas.
15.2. Sheila was late for school because she didn't leave home early enough.
IF
Sheila ___________________________________ home early enough.
Sheila wouldn't have been late for school if she had left home early enough
15.3. They failed to arrive at the party and they forgot to call to inform us about it.
ALSO
Not __________________________________ forgot to call to inform us about it.
Not only did they fail to arrive at the party but also forgot to call to inform us about it
15.4. ‘What do you intend to do?’, I asked.
INTENTION
I asked him ___________________________
I asked him what was his intention