高一英语下册单词汇总

　　344. If (we,you,he,she,it,they)+should

　　345. +动词原形

　　346. c. If I (we,you,he,she,it,they)+were to+动词原形347. I (we) should

　　348. You would +动词原形或：

　　349. he(she,it ) would

　　350. they would

　　351. I (we,you,he,she,it,they)+could(might)+动词原形

　　352. ②用法：

　　a) If it rains tomorrow, our picnic will be put off.(The weather has been changeable these days.)

　　b) If it rained tomorrow, our picnic would be put off.( The weather has beenvery good these days.)

　　c) If it should rain tomorrow, our picnic would be put off.(That would be out of our expectation.)

　　d) If it were to rain tomorrow, our picnic would be put off. (条件从句谓语动词用were to +动词原形，表示 下雨的可能性极小。Were to rain和should rain 都表示“出乎意料之外”，但were to加强表示“当初没想到以后的事”)

　　353. 混合时间条件句的用法：

　　i. 有时条件从句的动作和主句动作发生的 时间不一致。这时动词的形式，应根据它所要表达的具体时间来决定用什么形式。

　　b) If she hadn’t trained so hard, she wouldn’t be run so fast.(从句叙述过去，主句叙述现在。)

　　i. (fact: she has trained very hard, so she would able to run fast.)

　　ii. You would speak English well enough if you had practised reading and speaking it every day.(主句叙述现在，从句叙述过去)

　　iii. (fact: You didn’t practice (hasn’t practiced ) reading and speaking it every day, so you can’t speak English well enough.)

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