结构︰if + 现在式，主词＋情态助动词。
说明︰本句型实为句型之变体。之所以用情态助动词，主要是因为说话者对可能的结果不是太肯定或者是想表达例如必要的意思。
if it is fine tomorrow, we can go out. 如果明天天气好，我门可以出门。
if it is fine tomorrow, we could go out. 如果明天天气好，我门能够出门。
if it is fine tomorrow, we may go out. 如果明天天气好，我门可能出门。
if it is fine tomorrow, we might go out. 如果明天天气好，我门可能出门。
if it is fine tomorrow, we should go out. 如果明天天气好，我门宜于出门。
if it is fine tomorrow, we ought to go out. 如果明天天气好，我门宜于出门。
if it is fine tomorrow, we must go out. 如果明天天气好，我门必须出门。
if i should ..imperative sentence.
if i had v-ed, i would h**e ..
结构︰if…had＋过去分词…，主词＋would／should 等＋h**e＋过去分词。
说明︰这是与过去事实相反的假设。if 要用，则要用过去式（would，should，ought to，might，could）＋h**e＋过去。if 中的 had可置于前面，而省略 if。
if i had seen him, i would h**e told him the truth. 如果我当时看见他，我会告诉他实情。
i could h**e finished the task if i had had more time.
如果当时我能有多一点时间，我就能完成这项任务。
if we had known of your departure, we would h**e seen you off at the airport.
如果我们事先知道你要离开，我们会到机场送行。
i someone had been with him, he might not h**e been drowned.
如果有人在他旁边，或许他就不会溺死。
i might h**e been incredulous had i not been accustomed to such responses.
若非我已经习惯了这样的回答，我可能不敢轻易相信。
had he not apologize to her, she would not h**e forgiven him.
她（那时）不会原谅他，若非他道了歉。
had he not s**ed me, i might h**e been drowned. 我可能溺死了，若非他救了我。
had i proposed to you, would you h**e married me?
我要是当年向你求婚，你会答应嫁给我吗？
had you not helped us, we should h**e canceled this transaction.
假如没有你的帮助，这笔生意早就告吹了。
if i had v-ed, i would ..
结构︰if…had＋过去分词…，主词＋would／should 等＋原形动词＋now／today
说明︰这是不一致时的假设，亦称混合假设条件句。即：if 若与过去事实相反，用表示；而若与现在事实相反，则用过去式表示。此类句尾通常有表现在的，如 now，today 等。
if he had worked harder when young, he would be well off now.
如果他年轻时多努力一点，现在就能过得舒服些。
if i had been rich ten years ago, i could buy that house today.
如果十年前我有钱，今天我就能买下那栋房子了。
had he told the truth, he wouldn’t be punished now.如果他当时肯说实话，现在就不会受罪了。
had he followed the doctor’s advice, he might be alive now.
当时他要是听了医生的建议，现在可能还活着。
if only + v-ed
结构︰if only＋过去式／过去完成式。
说明︰此句型意为“要是…就好了。”用过去式，表示与现在事实相反；若用，则表示与过去事实相反。
if only i had a rich father. 要是我有个有钱的爸爸就好了。
if only he had been here. 要是他当时在这儿就好了。
if only i had another chance. 要是我再有一次机会就好了。
.. as if/as though ..
结构︰…as if／as though…现在式／过去式／过去完成式。
说明︰此句型意为“彷佛…；好像…一样”。as if，as though 是，引导。中，可用现在式，以表示事实；也可用过去式或，分别表示与现在或过去事实相反的。
he speaks like that as if he doesn’t want to attend the meeting.他那样说话，似乎不想参加会议。
he walks as if he is drunk. 他走起路来好像他真的醉了。
he felt as if he almost wished to kill them. 他感觉彷佛几乎要杀掉他们。
the baby opened the book as if he were able to read. 这个婴儿打开书本彷佛他会念书。
the nurse attends on the patient as if he were her father.
这**照顾这位病人彷佛在照顾她爸爸似的。
he ran into the room as if he had seen something terrible.
他跑进屋子，彷佛他看到什么可怕的东西。
she looks as if nothing had happened to her. 她当时看起来好像什么事都没发生似的。
it seems/looks as if ..
结构︰it seems／looks as if…
说明︰此句型意为“似乎…”。本句型中的 as if 可用以表示事实，或。
it looks as if it is going to rain. 好像要下雨了。
it seems as if he knows everything. 他似乎是个万事通。
it seems as if he knew everything, but in reality, he is as stupid as can be.
他似乎是个万事通。其实他是再愚蠢不过了。
it looks as if she had just come back from outer space.
她看起来彷佛刚从外层空间回来似的。
it seemed as if he had finished the work. 他似乎已经完成了这个工作。
it seemed as if he would never finish the work. 他似乎永远完成不了这个工作。
i demand/insist that ..
结构︰主词1＋意志动词（demand／insist 等）＋（that）＋主词2＋（should）＋原形动词。
说明︰意志有四类：建议（suggest，recommend，propose，advise，urge 等），要求（desire， ask，demand，require，request，maintain，insist 等），命令（order，command 等），规定（ rule，regulate，stipulate 等）。其后接 that-时，该里的要用原形或“should＋”。
美式英语通常省略 should。
the committee moved that the meeting (should) be adjourned. 委员提议休会。
his parents demanded that he (should) be back by ten. 他的父母要求他十点以前回家。
the employees demand that their salaries be raised. 员工们要求加薪。
they ruled that the law (should) not be imposed. 他们规定不应加重法律。
his father ordered that he (should) keep a diary in english.
他的父亲规定他要用英文写日记。
my mother encouraged me and insisted that i continue my education.
我妈妈鼓励我，而且坚持我应该继续我的教育。
he insisted that i (should) apologize to her. 他坚持我应该向她道歉。
recently, many states h**e insisted that high schools teach students how to drive.
最近，许多州坚持中学应该教学生如何开车。
his father insisted that they (should) move to the country. 他爸爸坚持他们应该搬到乡下。
it is proper ..that ..
结构︰it is＋意志形容词（important 等）＋（that）＋主词＋（should）＋原形动词。
说明︰意志包括 important，necessary，imperative，essential，urgent，desirable， advisable，recommendable，proper 等。that-中只能用 should，不可用 must，而 should 往往予以省略。
2023年职称英语考试卫生类B类卷
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distribute vt.分发，分配，v.分发 distribute sth.to 把某物分配，发 给 disturb vt.弄乱，打乱，打扰，扰乱v.扰乱 divide v.分，划分，分开 divide into 分成 divorce n.离婚，脱离vt.使离婚，与 脱离 be divorced...