1) ... you leave now, you'll be late for work. a) if b) unless 2) I'll call you ... I'm not busy in the afternoon. a) unless b) if 3) I'll go shopping .... I wake up early on Saturday.  a) if b) unless 4) ... you book your tickets in advance, you won't get to see the concert. a) unless b) if 5) ... you water the flowers regularly, they won't grow. a) if b) unless 6) ... it doesn't rain tomorrow, we will go on a picnic. a) if b) unless 7) ... he studies hard, he won't pass the exams. a) if b) unless 8) You can take any table ... it is reserved. a) if b) unless 9) They won't come to the party ... you invite them. a) if b) unless 10) ............. I meet him, I'll tell him the whole story. a) If b) Unless 11) I'm going to help my grandmother in the garden .................... it rains. a) if b) unless 12) We'll get lost in the forest ............ we find a map. a) if b) unless 13) He won't be able to buy a house ................. he wins the lottery.  a) if b) unless

unless vs. if

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