'When', 'if' and 'in case' (BBC Learners' Questions)

source: BBC Learning English    2017年7月28日
Honza from the Czech Republic says: what is the difference between the use of when and if in all types of conditional sentences?
And Trung from Vietnam, who writes: would you please explain to me the differences in use between in case and if?
Watch the video and complete the activity here: http://www.bbc.co.uk/learningenglish/...

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