C3:This is the first time I have joined such an exciting party 
=>I haven’t joined such an exciting party before 
C4:The children haven’t been taken to the park since 2012.
=>The last time the children were taken to the park was in 2012
C5:She last sent me letters last year 
=>She hasn’t sent me letters since last year.
=>The last time she sent me letters was last year.
C6:She moved to this city 4 weeks ago
=>She has moved to this city for 4 weeks.
C7:I last ate meat 5 years ago
=>I haven’t eaten meat for 5 years.
C8: It's years since I took photographs.
=>I haven’t taken photographs for years.
C9:The last time I saw him was 8 day ago 
=>I haven’t seen him for 8 day.
C10:She has driven for three months
=>She started driven for three month