be是英语动词中比较特殊的一类动词，其使用频率很高，牵涉到各种句型、时态和语态等用法，下面小编告诉你小学英语语法be动词的用法，大家一起来看看吧!
小学英语语法be动词的用法:
(一)be的时态变化
系动词be会有一般现在时、一般过去时、一般将来时、现在完成时、过去完成时等的时态变化。如:
He isa student.
They werein the park yesterday.
It will be cloudy tomorrow.
He has been ill for six days.
It had been three hours before she left the hat shop.
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(二)be与情态动词的连用
其用法为:情态动词+系动词be原形。如:
It must be Lucy's book. Her name is on the cover.
It can be very difficult for us to memorize too many words within such a short time.
She should be here on time tomorrow.
助动词be的用法:
1. be +现在分词，构成进行时态。如:
They are having a meeting. 他们正在开会。
We were planting trees this time yesterday. 我们昨天这个时候在植树。
2. be + 过去分词，构成被动语态。如:
The door was broken by Tom. 门是汤姆打破的。
English is taught in our school. 我校教英语。
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3. be + 动词不定式，可表示:
A. 打算、决定、计划、安排等。如:
He is to visit Japan next week. 他决定下周访问日本。
I was to have told you yesterday, but you were not in. 我本打算昨天告诉你的，但你不在家。
B. 指示、命令、禁止等，即“必须，一定”。如:
You are to hand in the exercises tomorrow. 你们明天必须交练习。
You’re not to (=You mustn’t) smoke here. 你不可以在此处抽烟。
C. 责任、义务、需要，即“该不该”。如:
You are to (=should) report to the police. 你应该报警的。
Am I to go on with the work? 这工作我该不该继续干下去?
D. 可能性，与can, may相当，不定式多用被动式。如:
The book was not to (=could not) be found. 那本书可能找不到了。
E. 假设，用于虚拟条件句中。如:
If it were to rain, we would get wet. 要是下雨，我们就会淋湿。
F. 表示注定要发生或后来必然发生。如:
This experience was to change his life. 这次经历注定要改变他的生活。
注:不定式作表语与上述用法是不同的。如:
My idea is to go there today. 我的意思是今天就去那里。
compare的用法、句型与搭配:
1. 表示“把……与……比较”，通常用compare…with…，但在现代英语中，也可用compare… to…，或者用compare…and…。如:
If you compare his work with [and] hers, you’ll find hers is much better. 要是把他俩的工作比较一下，就会发现她的好得多。
Having compared the new dictionary with [to, and] the old one, he found the new one more helpful. 将新旧词典比较之后，他发现新词典更有用。
2. 表示“把……比作……”，通常用compare…to…，一般不用compare…with…。如:
Shakespeare compared the world to a stage. 莎士比亚把世界比作舞台。
The poet compares the woman he loves to a rose. 诗人把他所爱的女人比作玫瑰。
3. 在compared to [with](与……相比)这一习语中，用to或with已没什么区别。如:
Compared with [to] him, I’m just a beginner. 和他相比，我只是一个初学者。
Compared to [with] many women, she was very fortunate. 和许多女人相比，她算是很幸运的了。
4. 用作不及物动词时，其后习惯上只接with，多与情态动词can连用，表示“比得上”“能与……比美”，但一般用于否定句或疑问句中。如:
Nothing can compare with wool for warmth. 没有比羊毛更暖和的东西了。
Life in a town can’t compare with life in the country. 乡村的生活比城镇的生活好得多。
find 的用法与搭配:
1. 表示“找到”，其后可接双宾语;若双宾语交换位置用介词 for引出间接宾语。如:
Can you find me a hotel?=Can you find a hotel for me? 你能给我找一家旅馆吗?
We found him a good job.=We found a good job for him. 我们为他找了份好工作。
比较下面一句(found 后为复合宾语):
We found him a good teacher. (=We found that he was a good teacher.) 我们发现他是位好老师。
2. 表示“发现”时，其后可接各种形式的复合结构:
(1) 宾语+名词作宾语补足语。如:
You’ll find it a difficult book. 你会发现它是一本难懂的书。
有时可在宾语补足语前加上to be。如:
You’ll find it to be a difficult book. 你会发现它是一本难懂的书。
(2) 宾语+形容词作宾语补足语。如:
He found the room empty. 他发现房间是空的。
I found the book easy. 我觉得这书读起来比较容易。
有时可在宾语补足语前加上to be。如:
We find the story (to be) very interesting. 我们发现这个故事很有趣。
(3) 宾语+副词作宾语补足语。如:
Did you find her in? 你发现她在家吗?
I went to her house but I found her out. 我到她家发现她不在家。
用作宾语补足语的副词通常只能是in, out, up, down, upstairs, downstairs等表示处所的副词小品词，而不能是其他普通副词。
(4) 宾语+不定式作宾语补足语。如:
He found the patient to be a small boy. 他发现病人是一个小男孩。
用作宾语补足语的不定式通常为to be(且通常可以省略)，但当find用于被动语态时，可以用其他动词。如:
Her blood was found to contain poison. 她的血液里被发现有毒。
He was found to have helped himself to public money. 他被发现挪用了公款。
(5) 宾语+现在分词作宾语补足语。如:
I found him lying on the floor. 我发现他躺在地板上。
I found him standing at the door. 我发现他正站在门口。
(6) 宾语+过去分词作宾语补足语。如:
He found the door locked. 他发现门锁上了。
He found the city much changed. 他发现这个城市发生了巨大的变化。
(7) 宾语+介词短语作宾语补足语。如:
We found her in tears. 我们发现她在哭泣。
We found the map quite out of date. 我们发现这地图已完全过时。
另外还要注意“find+形式宾语it+宾语补足语”结构。如:
I find it easy to get on with her. 我发现她很容易相处。
He found it easy to earn extra money. 他发现赚点外快很容易。
I found it interesting being back at school again. 我发现再次回到学校很有意思。