1.all together的意思跟together的意思类似，可以解释为“with each other’ or 'at the same time', and is similar to together”，即一起、一道、同时。即全部在同一地方或同一时间。例如：
Can you put your books all together in this box?
你能把你的书都放进这个箱子里吗？
We put our cards all together in one pile. 我们把卡片放成一堆。
Put your clothes all together in one pile and I’ll wash them for you.
把你的衣服放在一起，我会帮你洗好。
The last time we were all together was in 2020.
我们所有人上一次聚在一起还是2020年。
"Are you all together?" "Yes, Can you do a table for six?" “你们是一起的吗？” “是的，能帮我们安排一张6人桌吗？”
Let’s sing ‘Happy Birthday’. All together now!
咱们来唱“生日快乐”。现在一起唱！
The two iron balls fell to the ground all together.
这两个铁球同时落地。
2.altogether副词，意思跟all together不一样，altogether是副词，表示:完全地（相当于completely、entirely）彻底地、总计或者总共地（in total）、总的来说。例如：
I believe it is time to ban tobacco advertising altogether.
我认为该完全禁止烟草广告了。
We were not altogether sure that the comet would miss the Earth
我们不能完全肯定彗星不会与地球相撞。
His objective was to kill the space station project altogether
他的目的是使空间站项目全面停止。
I don't altogether agree with you.
我不完全同意你的意见。
I am not altogether convinced by this argument.
我不完全信服这一论据。
I suspect he isn't altogether unhappy about my absence
我猜想他对我的缺席并没有感到很不高兴。
His tour may have to be cancelled altogether
他的旅行可能不得不彻底取消。
When Artie stopped calling altogether, Julie found a new man
当阿蒂彻底不再上门后，朱莉又找了个男人。
The long-range goal must be to do away with nuclear weapons altogether.
远期目标必须是将核武器尽数销毁。
What he said was altogether another thing. 他讲的完全是另外一件事情。
This actually is an altogether different game.
这其实是个完全不同的游戏。
It cost over a thousand dollars altogether.
总共得花1000多美元。
There were altogether ten students who attended the game .
共有10个学生参加了比赛。
Altogether, it was a delightful town garden, peaceful and secluded.
总体上说，这是个令人愉快的城市花园，宁静而偏僻。
巧妙记忆
“all together” 和 “altogether”两者虽然读音一样，写法也有一定相似性，但两者在意思上是完全不一样的。
“all together”由两个单词在一起组成的短语，我们取“一起”即可联想到含义是“一起、一道、同时”，而“altogether”则是副词，完完全全是一个一个单词，联想到其含义是“完全地”，进而想到其所有含义“完全地、彻底地、总共；全部地；总的来说”。
这个记忆方法是不是很快就记住了两个知识点。
最后强调一点它们可以表达数目上：共有、共计；用在这个时候它们是可以通用的。
All together there are six new faces in the cabinet.
内阁现在共有6张新面孔。
《柯林斯高阶英汉双解学习词典》
How much is it with material and labour all together?
连工带料，一共多少钱？
《汉英大词典》
You owe me £68 altogether.
你一共欠我68英镑。
We have invited fifty people altogether.
我们共邀请了五十人。《牛津高阶英汉双解词典》
There are altogether 40 students in this class.
这个班总共有40名学生。
《汉英大词典》
Britain has a dozen warships in the area, with a total of five thousand military personnel altogether
英国在该地区驻有12艘战舰，共有5,000名军人。
《柯林斯高阶英汉双解学习词典》
