(2)only if表示“只有，只要”，引导条件状语从句，不用虚拟语气；若其引导的从句置于句首，且与主句之间没用逗号隔开，则主句要用倒装。

　　④In a word, only if you learn English by using it can_you_learn it well.

　　总之，只有通过使用英语的方法学英语，你才能学好它。

　　Ⅰ.基础点全练

　　1．单句语法填空

　　①While walking (walk) down a dark street one evening, I heard screams coming from behind the bushes.

　　②To deal with the global financial crisis, our country has worked out a string of forceful measures over the past months.

　　③As many as 150 miners died in the accident. If only the mine owners had_paid (pay) enough attention to the safety measures!

　　④He glanced at the clock and found it was time to pick up his son from school.

　　⑤Some exercises appear to be the ones you have done, but on second thoughts, you'll find that they're different.

　　⑥There will be many challenges ahead, but I have confidence that I'll take on the burden.

　　⑦He took hold of her wrists so she couldn't get away.

　　⑧If you give me your photo, I'll give you mine in return.

　　2．运用所学短语完成片段

　　I ①glanced_at (瞥一眼) the problem quickly, but it was very difficult. I had been puzzled over the problem for over an hour without any result, when ②all_at_once (突然) a solution flashed across my mind. ③On_second_thoughts (重新考虑后), I had the answer. My answer ④corresponded_with (与……相一致) the suggested answer. My deskmate also ⑤approved_of (赞成) my answer to the problem.

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