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一、用 if 或 unless 填空。
1. You will not improve your skill in a short time ______ you practise playing the violin regularly.
2. ______ you don't work hard, you will fail the exam.
3. Tom can't be here on time ______ he gets up early.
4. ______ you don't have enough sleep, you will feel tired.
5. ______ you finish your homework, you will not go out to play.
1. You will not improve your skill in a short time ______ you practise playing the violin regularly.
2. ______ you don't work hard, you will fail the exam.
3. Tom can't be here on time ______ he gets up early.
4. ______ you don't have enough sleep, you will feel tired.
5. ______ you finish your homework, you will not go out to play.
答案
1. unless 2. If 3. unless 4. If 5. Unless
二、用括号中所给单词或短语的适当形式填空。
1. If Amy takes part in the game show, she ______ (win) a prize.
2. Unless you try your best, you ______ (not realize) your dream.
3. Everybody ______ (be) sad if we don't win the football match.
4. If you ______ (not keep) the meat in the fridge, it will go bad.
5. Unless I ______ (invite), I won't go to the party.
6. If this ______ (go) on, the wild animals will soon have nowhere to live.
1. If Amy takes part in the game show, she ______ (win) a prize.
2. Unless you try your best, you ______ (not realize) your dream.
3. Everybody ______ (be) sad if we don't win the football match.
4. If you ______ (not keep) the meat in the fridge, it will go bad.
5. Unless I ______ (invite), I won't go to the party.
6. If this ______ (go) on, the wild animals will soon have nowhere to live.
答案
1. will win 2. won't realize 3. will be 4. don't keep 5. am invited 6. goes
( )1.You won't pass the PE exam successfully ______ you exercise every day.
A.if
B.unless
C.as long as
D.since
A.if
B.unless
C.as long as
D.since
答案
B【点拨】if如果；unless意为“除非，如果不”，相当于if...not；as long as只要；since由于。根据语境可知，后句是前句的否定条件，应用unless引导条件状语从句。故选B。
( )2.Our country will be much better for everyone in future ______ we all do something to help now.
A.if
B.before
C.so that
D.even though
A.if
B.before
C.so that
D.even though
答案
A【点拨】if意为“如果”，引导条件状语从句；before意为“在……之前”，引导时间状语从句；so that意为“为了”，引导目的状语从句；even though意为“即使”，引导让步状语从句。根据语境可知，本句用if引导条件状语从句。故选A。
( )3.I don't know if it ______ sunny tomorrow. If it ______ sunny, I will go fishing.
A.will be; is
B.is; will be
C.will be; is going to be
D.will be; will be
A.will be; is
B.is; will be
C.will be; is going to be
D.will be; will be
答案
A【点拨】前句是if引导的宾语从句，主句是现在时，根据tomorrow可知，宾语从句中用一般将来时“will do”，排除B；后句是if引导的条件状语从句，时态遵循主将从现原则，从句用一般现在时，排除C、D。故选A。
( )4.—You are not supposed to enter the teachers' office ______.
—Thanks, Mum, I got it.
A.unless you are allowed to
B.if you want to ask questions
C.when you are asked to come in
D.where you are going to
—Thanks, Mum, I got it.
A.unless you are allowed to
B.if you want to ask questions
C.when you are asked to come in
D.where you are going to
答案
A【点拨】A项意为“除非你被允许”；B项意为“如果你要问问题”；C项意为“当你被要求进入的时候”；D项意为“你将要去哪里”。根据语境可知选A。
( )5.______, you will get good grades.
A.If you will work hard
B.If you work hard
C.If you worked hard
D.If you are working
A.If you will work hard
B.If you work hard
C.If you worked hard
D.If you are working
答案
B【点拨】含有if引导的条件状语从句，句子时态遵循“主将从现”的原则。故选B。
( )6.(2024·江苏常州新北区常州外国语学校一模)—It's reported that the plastic pollution is seriously harming the global oceans.
—Yes, and I think it will be worse ______ stronger laws are made.
A.since
B.until
C.after
D.unless
—Yes, and I think it will be worse ______ stronger laws are made.
A.since
B.until
C.after
D.unless
答案
D【点拨】since自从；until直到……为止；after在……之后；unless除非。根据worse和“stronger laws are made”可知，这里应该用unless引导条件状语从句。故选D。
