She will be late  - if the train is delayed, If Henry doesn't phone this afternoon, - I will phone him in the evening, If it rains tommorrow, - We won't be able to have a picnic in the park, Your parents will miss the plane - if they don't leave soon., If I'm sick, - will you take care of me?, I will buy a new bicycle - if I can afford it., Jack won't come to the party - if you don't invite Susan, If I get back later than midnight, - my parents will be angry., If we don't find the keys, - we will have to change the front door lock, If you don't go to bed early, - you'll be very tired for the exam tomorrow.,

First conditional

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