首先我们来看下almost、mostly的大致意思
almost：词性为副词，表示接近程度或差距很小的情况，常用于描述数量或程度接近完全但还有一点差距的情况。
mostly：词性为副词，表示事物或情况的主要部分或占大部分比例的情况。
通过下面的图我们了解下almost、mostly的含义、发音和用法
接下来我们讲解几个用例，希望这些用例可以加深您的理解
almost：
This is almost an impossible task.
(这几乎是不可能完成的任务。)
They almost eat together every day.
(他们几乎每天都一起吃饭。)
I am almost out of money.
(我几乎没钱了。)
There is almost nobody in that place.
(那个地方几乎没有人。)
She is almost always late.
(她几乎总是迟到。)
He said almost nothing.
(他几乎没说话。)
mostly：
He is mostly in charge of this project.
(这个项目主要由他负责。)
She mostly spends her time reading.
(她大部分时间都在读书。)
They mostly play outside most of the time.
(他们通常大部分时间都在外面玩。)
I am mostly concerned with this issue.
(我主要关注这个问题。)
This book mostly describes historical events.
(这本书主要描述了历史事件。)
The weather in this city is mostly hot most of the time.
(这个城市的天气大部分时间都很炎热。)