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It构成的句型在英语写作中十分常见，现归纳如下：
1. It is / was time （for sb.） to do sth. 意为“（对某人来说）该是做某事的时候了”。
It is / was time for sth. 意为“该是做某事的时候了”。
It is time for sth. = It is time to do sth.
例 It's time for me to go to school. 我该去上学了。
It's time for sleep / to go to sleep. 该睡觉了。
2. It takes / took （sb.） some time to do sth. 意为“（某人）花时间做某事”。
例 It takes （me）10 minutes to go to school by bus. 我乘公共汽车上学要花10分钟。
3. It is / was one's turn to do sth. 意为“轮到某人做某事了”。
例 It's your turn to answer the question. 轮到你回答问题了。
4. It is / has been +时间段+ since从句（一般过去时）。在这一句型中，如果since从句的谓语动词是非延续性的，则意为“自从……以来已过了……（时间）”。
例 It is two years since Tom came to China. 汤姆来中国已经两年了。
It has been three years since they got married. 他们结婚已经三年了。
拓 另外，这一句型还可延伸为It was +时间段+ since从句（过去完成时）。
It was three years since he had left here. 他离开这里才三年。
5. It + seems / appears / happens / matters ... + that ...，意为“看起来/似乎……”，It后接系动词。
例 It seems that most of the students are afraid of math. 似乎大部分学生惧怕数学。
It appears that he doesn't like the new environment. 看起来，他不喜欢新环境。
6. It is / was + adj. / （a, an） n. + （for sb.） to do sth. / that ... 对某人来说是……
例 It is important / of great importance for us to protect the environment. 保护环境对我们来说很重要。
It is a pity that I cannot go to see the movie with you on Friday evening. 很遗憾，周五晚上我没办法陪您去看电影了。
7. It is / was + said / reported / believed / thought + that ... ，意为“据（说、报道、相信、认为）”。
例 It is said that our new English teacher is good at singing. 据说，我们的新英语老师很会唱歌。
8. It is no use / good doing sth. 意为“做某事是没有用的”。
例 It is no use crying about the past. 过去的事哭也是白费力气。
It is no good learning without practice. 没有实践的学习是没用的。
9. It is / was +被强调部分+ that +句子的其余部分
例 It is human activities that have caused global warming.正是人类的活动导致全球变暖。
There be句型是英语写作中十分有用的句型之一。There be结构是英语中陈述事物客观存在的常用句型，表达“某个地方（或某个时间）有某物或人”，常用“There be +名词+地点（时间）”这一句型。例如：
1. There be +主语+介词短语
例 There is an orange, two apples and five peaches on the table. 桌子上有一个橘子，两个苹果和五个桃子。
There were many people present at the meeting yesterday. 昨天有很多人参加了会议。
There have been many changes in recent years. 近几年发生了许多变化。
There will be a National Day evening party tomorrow. 明天将会有一场国庆晚会。
（be的形式与其后最近的名词保持一致，俗称就近原则）
2. There can / may / must be ... there be与情态动词连用
例 He looks pleased; there must be some good news. 他看上去很开心，一定有什么好消息。
There may be other living things in the universe. 宇宙中可能有其他生物存在。
3. There live / stand / come / lie / remain / seem / appear / exist / happen ...
例 As we all know, with the development of modern science and technology, there appears a great many problems related to mobile phones. 众所周知，随着现代科技的发展，出现了许多与手机有关的问题。
4. There be no use / good + doing sth.做某事没有用/没有意义
例 There is no use wasting time in discussing the matter. 浪费时间讨论这件事是没有意义的。
There is no good spending too much time playing computer games. 花太多时间玩电脑游戏没有好处。
1. 以here、there、now、then等副词开头的句子，需使用全部倒装
例 Here are some suggestions to help prepare in advance. 以下是一些建议，有助于提前做好准备。
Then came a new problem. 接着出现了个新难题。
2. 具有（半）否定意义的词或短语，如seldom、rarely、not、never、by no means、in no time、hardly ... when ...、no sooner ... than ...、not only ... but also ...位于句首时，用部分倒装。
例 Not only can she sing, but she can dance as well. 她不仅会唱歌而且还会跳舞。
Never should we ignore traffic rules. 我们绝不能忽视交通规则。
Seldom did I eat vegetables, but now it is different. 以前我很少吃蔬菜，但现在不同了。
3. as引导的让步状语从句
例 Hard as he tried, he did not get good marks in the exam. 虽然他很努力，但是在考试中还是没取得好成绩。（状语+ as +主语+谓语动词）
Child as he was, he made up his mind to be a scientist. 尽管他还是个孩子，但他下定决心要当一名科学家。（表语+ as +主语+系动词）
Fail as he did, he would never give up. 虽然他失败了，但他不会放弃。（动词原形+ as +主语+ ...）
4. only引导的倒装句
例 Only by working hard, can we pass the exam. 只有通过努力学习，我们才能通过考试。
Only in this way, can I keep healthy and confident. 只有这样，我才能保持健康和自信。
Only then did we realize the importance of saving resources. 直到那时我们才意识到节约资源的重要性。
感叹句是表示喜怒哀乐等感情的句子，一般以how或what引导。How后接形容词或副词，what后接名词。感叹句句末通常用感叹号。
1. what引导的感叹句
（1）What +名词（+主语+谓语）！
例 What a relief! 真令人欣慰！
What a surprise! 真是一个惊喜！
What a waste of time it was! 真是浪费时间！
（2）What + a / an +形容词+名词（+主语+谓语）！
例 What a good time! 多愉快的一天啊！
What a beautiful girl she is! 她是个多么漂亮的女孩啊！
What an interesting story it is! 多么有趣的故事啊！
2. how引导的感叹句
（1）How +形容词/副词（主语+谓语）！
例 How nice! 多好啊！
How beautiful the girl is! 这个女孩多么漂亮！
How fast the player runs! 这个运动员跑得多快啊！
（2）How +形容词+ a / an +单数可数名词+主语+谓语！
例 How modern a city it is! 这是个多么现代化的城市啊！
How outgoing and warm-hearted a boy he is! 他是个多么外向和热心的男孩子啊！
（3）How +主语+谓语！
例 How he worked! 他多么能干啊！
How he missed his mother! 他多么想念他的母亲啊！
How I wished for a chance to take part in the competition!
我多么希望有机会参加比赛啊！
祈使句是表示请求、命令、劝告、祝愿或建议的句子。祈使句的主语一般为第二人称，即主语you，但常省略，祈使句的谓语用动词原形。
1. Do型：动词原形（+宾语）+其他成分
例 Come and play with me. 来和我玩呀。
Open the door please. 请打开门。
Don't run a red light. 不要闯红灯。
Don't be discouraged by the first failure. 不要因第一次失败就灰心丧气。
2. Never型：Never +动词原形+其他成分
例 Never give up! 决不放弃！
Never put off your homework till tomorrow. 千万不要把你的家庭作业拖到明天。
拓 祈使句的否定式多以Do not / Don't开头，也可用Never构成。
3. Be型：Be +表语（名词/形容词）+其他成分
例 Be quiet! 安静！
Be careful in the exam!考试时要认真！
Be a hard-working student! 要做一个努力的学生！
拓 Be型也可在整个结构之前加Do或Don't，起到强调的作用。如：
Do be careful! 一定要小心！
4. Let型：Let +宾语+动词原形+其他成分
例 Let me have a try. 让我试一试。
Let me know if you can attend the party. 如果您能参加聚会，请告诉我。
Let's work together to make our school more beautiful. 让我们一起努力，使我们的学校更美丽。
拓 Let型的否定式有两种：
（1）以Let开头的祈使句，如果后面跟第一、第三人称名词或代词的宾格，则用“Don't let +宾语+动词原形+其他成分”或“Let +宾语+ not +动词原形+其他成分”。如：
Don't let time slip by. / Let time not slip by. 不要让时光白白流逝。
（2）以Let's开头的祈使句，必须在Let's后加not。如：
Let's not spend too much time on playing games. 我们不要在玩游戏上花太多时间。
5. No型：No +名词/动名词，用于表示禁止
例 No smoking! 禁止吸烟！
No parking! 禁止停车！
No visitors! 游人止步！
6. 祈使句+ and / or +简单句
例 Study hard and you will make progress every day. 好好学习，天天向上。
Study hard, or you will fail in the exam. 努力学习，否则你会考试不及格。
拓 在本句中，祈使句表条件，简单句就是主句，表结果。