★ begin is a little bit more formal than start.
begin 比 start 更正式一点。
eg：When did you begin learning English?
★ begin 的名词是begining
eg：Everything is difficult at the beginning.
★ start 更加口语化
eg：When did you start learning English?
★ Start can also be used to talk about machines.
eg：Press this button to start the computer.
★ Also, when you are talking about creating a new business you use start
eg：A lot of young people today want to start businesses.
★ Start is also a noun.
eg：Everything is difficult at the start.
What do you have to do after you get up?
Let's go and wash your face
Let's go and wash your hands
Let me help you wash your face.
You need to brush your teeth
Do you know where your toothbrush is?
Spit it out.
Brush your teeth properly.
雅思原题：Describe your first mobile phone
The first mobile phone that I had was when I was at secondary school. I was probably about 13 or14 years old when I bought my first mobile phone. I remember that a lot of my friends started to buy phones.
And I really wanted to have a phone. I had to persuade my parents for a long time, because when I was younger, they did not want me to have a mobile phone at all. They kept asking me why I wanted to have a phone, who was I going to call on it and what was I going to do with it.
But eventually so many people had phones and they wanted to be able to contact me as well. So they gave in and I was able to buy a phone. This phone was a Nokia 3310. It had a black and white screen and a number of very loud ring tones.
It also had a vibrate function which was very useful. It made my life very convenient because I was able to keep in constant contact with my friends and my parents and even play the odd game of snake when I had some free time so it's good to have a phone when you're out and about.