I came here for studying English.	I came here to study English.	
It is difficult for me to understand native speakers.	I am difficult to understand native speakers.	
Before left the office, she turned off the lights.	Before leaving the office, she turned off the lights.	
In Hong Kong there has a lot of tall buildings.	In Hong Kong there are a lot of tall building.	
Most shops are opened around nine.	Most shops open around nine.	
This is the first time I have done a grammar course.	This is my first time to do a grammar course.	
I remember going to Beijing when I was a child.	I remembered going to Beijing when I was a child.	
If you want to go to Europe you will need to save more money.	If you want to go to Europe you will need to save a lot of money.	
She gave a really nice birthday gift to me.	She gave me a really nice birthday present.	
I suggest you try and get some more practice.	I suggest you to try and get some more practice.	
You may take the plane to Shanghai. It’s very quick.	You can take the plane to Shanghai. It’s very quick.	
This course finishes in August.	This course will finish in August.	
She goes to work at nine o’clock.	She will back to the office at nine o’clock.	
Please remember to bring your litter home.	Please remember to take your litter home.	
She succeeded in passing the diploma course.	She was success in passing the diploma course.	
I spoke to your staff about the problem.	I spoke to one of your staff about the problem.	
She told me a really good news.	She told me some really good news	

Answers	

I came here for studying English.	I came here to study English.	
It is difficult for me to understand native speakers.	I am difficult to understand native speakers.	
Before left the office, she turned off the lights.	Before leaving the office, she turned off the lights.	
In Hong Kong there has a lot of tall buildings.	In Hong Kong there are a lot of tall building.	
Most shops are opened around nine.	Most shops open around nine.	
This is the first time I have done a grammar course.	This is my first time to do a grammar course.	
I remember going to Beijing when I was a child.	I remembered going to Beijing when I was a child.	
If you want to go to Europe you will need to save more money.	If you want to go to Europe you will need to save a lot of money.	
She gave a really nice birthday gift to me.	She gave me a really nice birthday present.	
I suggest you try and get some more practice.	I suggest you to try and get some more practice.	
You may take the plane to Shanghai. It’s very quick.	You can take the plane to Shanghai. It’s very quick.	
This course finishes in August.	This course will finish in August.	
She goes to work at nine o’clock.	She will back to the office at nine o’clock.	
Please remember to bring your litter home.	Please remember to take your litter home.	
She succeeded in passing the diploma course.	She was success in passing the diploma course.	
I spoke to your staff about the problem.	I spoke to one of your staff about the problem.	
She told me a really good news.	She told me some really good news