首先是因为的英文

We're going to Japan at the beginning of July.

我们七月初要去日本。

At the beginning of the war things were looking very doubtful.

战争刚开始时，形势看上去很不明朗。

To start with, the pressure on her was very heavy, but it's eased off a bit now

一开始，她的压力很大，但现在已经好些了。

In learning any language, to start with the classics is to begin at the wrong end.

无论学习哪种语言，从古典作品学起的方法是不对头的。

First of all we should make primary education universal.

首先我们应普及初等教育。

First of all, let's set the scene.

首先让我们来叙述一下背景。

First of all, you should know what profession suits you.

首先，你该知道什么职业适合你。

To begin with, you have confused two different things.

首先，你已经把两种东西弄混了。

To begin with, I do not like its color.

首先，我不喜欢它的颜色。