decide的用法及短语是动词，表示：决定、判断、断定、认定、认为的含义，可以用于及物动词和不及物动词，在做及物动词的时候，后面可以跟宾语，在做不及物动词的时候，后面是不可以跟宾语的。
They decided to sound out her interest in the project.
他们决定试探一下她对那个项目的兴趣。
We decided that in the game we would be physical and aggressive.
我们决定在比赛中积极拼抢，大胆进攻。
I worried for ages and decided that I had better break it to her.
我烦恼了很长时间，后来决定还是把这事告诉她。
It is always possible that the judge may decide against you.
法官判你败诉总是有可能的。
The case will be decided by a jury.
这案件将由陪审团裁决。
He decided Franklin must be suffering from a bad cold...
他断定富兰克林一定是得了重感冒。
The government decided that their testimony would be irrelevant to the case.
政府认定他们的证词与案件不相关。
America decided that imported steel had an unfair advantage over steel made at home
美国认定进口钢铁相对于国产钢铁具有不公平的优势。
The government has clearly decided that a cut in interest rates would be politically expedient.
政府显然认定削减利率是政治上的权宜之计。
She decided that I was the ideal person to take over the job
她认定我是接手这份工作的最佳人选。
Parliament had decided that his removal from power was illegal.
国会决议认为他的免职是非法的。
The government has decided that the publication of the report would be 'contrary to the public interest'.
政府认为发表这份报告将会“违背公众的利益”。
The dentist may decide that the wisdom teeth need to be extracted.
牙医可能会认为智齿需要拔掉。
She decided that her doctor's advice sounded pretty good
她认为医生的建议似乎很不错。
The pilot decided that Christchurch was too far away, and played it safe and landed at Wellington. 飞行员认为克赖斯特彻奇距离太远，为求稳妥，就降落在了惠灵顿。
They may well decide that their interests would be best served by joining in.
他们很有可能认定参与其中才会令其利益最大化。
When Ted was six we decided that he needed to know how to fasten and unfasten his seat belt
特德六岁的时候，我们认为他得知道如何系上和解开安全带了。
George caught the look and decided that Bess had better leave before she exploded.
乔治看到这一表情，认为最好让贝丝在发作之前离开。
1、decide比较常用的是decide to do sth决定做某事，后面跟to不定式。
I decided to play along with her idea.
我决定假意听从她的意见。
2、decide的短语有：
decide for 作出有利于某的决定
decide in favour of 赞成做某事
decide on 决议；作出决定,选定
Have you decided on a working title for your thesis yet?
你选了论文的暂定题目吗？
After leaving university, Therese decided on a career in publishing.
大学毕业后，特蕾泽决定从事出版行业。
What made you decide on a career as a vet?
是什么驱使你选择兽医这门职业的？
Vietnam is trying to decide on its course for the future.
越南正在努力确定其未来发展的方向。
If the answer is 'yes', then we must decide on an appropriate course of action
如果答案是肯定的，那么我们必须商定合适的行动方案。
decide upon 决定；
decide against 决心不，决定不采取，决定反对，判决
decide against 在两者中选择其一，
decide about (v+prep)决定，
make a decision on sth 在某事上作出决定。
I am keeping my options open. I have not made a decision on either matter.
我保留选择权，这两件事我都还没有作出决定。
We'll make a decision on that further down the line.
我们将在以后的阶段对此问题作出决策。
3.decide后接的从句可以使用现在时虚拟语气，即should +动词原形（should可以省略），表示说话者的一种惊讶、赞赏、讨厌等语气或态度。
It was decided (that) the school (should ) purchase new software.
已经决定学校要购买新软件。
They decided that the strike continue.
他们已经决定继续罢工。
It was decided that our veterinary screening of horses at events should be continued.
已经决定继续对参赛马匹进行疾病筛查。
当然也可以使用陈述句语气。不含语气和态度，只作事实的陈述，该使用什么时态还是使用什么时态。
She decided (that) she wanted to live in France.
她决定要住在法国。
The company has decided it must present a more modern image.
公司已决定，必须展现出更加现代的形象。
He might decide that it is best to induce labour.
他也许决定最好引产。
He decided that he would drive back to town instead of putting up for the night at the hotel.
他决定开车回镇上，不在旅馆过夜。
He decided that he couldn't just slink away, so he went and sat next to his wife.
他决定不能偷偷溜走，于是便走到妻子身边坐下。
The Taylors decided that they would employ an architect to do the work.
泰勒家决定雇个建筑师来干这个活。
4.关于decision用法
其后只能接动词不定式，类似词语还有：invitation, inclination, refusal, willingness, will等
Who took the decision to go ahead with the project?
是谁决定继续这项工程的？
Who made the decision to go there?
谁做出去的那儿的决定？
The Prime Minister’s decision to resign was welcomed by the Opposition.
总理辞职的决定受到了反对党的欢迎。
如同suggest, decide, require, request, demand, order, insist，ask, prefer, propose, recommend 等动词要求其宾语从句使用现在时虚拟语气（Be型虚拟语气）一样，它们的名词的同位语从句或表语从句也要求使用现在时虚拟语气。英国语大都使用：should do;美国语大都使用：do。请看：
Our decision is that the school remain closed.
我们的决定是学校继续关闭。
具有类似语法特征的名词还有：decree, demand, order, resolution, proposal, suggestion, request, requirement, conviction等。