And now I'll announce a winner of the competition.	
Before left the office, she turned off the lights.	
By the time I retire, I will be working here for 30 years.	
Bye! I'll see you after three weeks' time.	
Coca-Cola has being sold around the world for over a hundred years.	
Grammar is so difficult subject for me.	
I always enjoy to watch the World Cup.	
I came here for studying English.	
I expect I would go out on Sunday but I'm not sure.	
I explained her I am busy.	
I have been kept waiting for an hour but eventually they let me in.	
I remember going to the cinema when I was five.	
I will have dinner with my friends this evening.	
I'll see you all on next Thursday.	
I'm easy to speak in English but I'm hardly to listen.	
I'm fed up of have to work every day.	
I'm not understanding how to use the present perfect tense.	
I'm sick of doing overtime every night.	
I've had this watch since I have come here.	
If you would have a million dollars, what will you do?	
In Hong Kong there has a lot of tall buildings.	
It doesn't work because it hasn't been repaired yet.	
Last year the company has introduced a new stock control system.	
Many peoples like watching football.	
Maths is more easy than English.	
Mt Everest is the more tall mountain in the world.	
She asked me will I like to come.	
She gave him a tip, which I thought was unnecessary.	
She got off the car and went into the shop.	
She said she went there before.	
She went to Beijing to learn Chinese.	
That's Tom Cruise, isn't it?	
The agreement is between America, China and Japan.	
The classroom was redecorating last week.	
The new machines are being tested tomorrow morning.	
The sun is rising in the east.	
Their flat isn't as big than Sarah's.	
There are far more people this week than last week.	
There are less people this week than last week.	
They gave us a map, that helped us a lot	
They have few money so they can't go on holiday this year.	
He's going to finish the work on Friday.	
This course finishes in June.	
This is my first time to be in Switzerland.	
This one isn't nearly as big as the one we had before.	
When I was a child I not wanting to go to school.	
You did remembered to lock the door, I suppose.	
You have been here before, didn't you?	
You're going to the party, won't you?	
You're Margaret, isn't it?	

Scroll down for corrected sentences

Corrected sentences

And now I'm going to announce a winner of the competition.	
Before she left / leaving  the office, she turned off the lights.	
By the time I retire, I will have been working here for 30 years.	
Bye! I'll see you in three weeks' time.	
Coca-Cola has been sold around the world for over a hundred years.	
Grammar is such a difficult subject for me.	
I always enjoy watching the World Cup.	
I came here to study English.	
I expect I will go out on Sunday but I'm not sure.	
I explained to her I was busy.	
I was kept waiting for an hour but eventually they let me in.	
I remember going to the cinema when I was five.	
I'm having dinner with my friends this evening.	
I'll see you all  next Thursday.	
It's easy for me to speak in English but it's difficult to listen.	
I'm fed up of having to work every day.	
I don't understand how to use the present perfect tense.	
I'm sick of doing overtime every night.	
I've had this watch since I came here.	
If you had a million dollars, what would you do?	
In Hong Kong there are a lot of tall buildings.	
It doesn't work because it hasn't been repaired yet.	
Last year the company introduced a new stock control system.	
Many people like watching football.	
Maths is easier than English.	
Mt Everest is the tallest mountain in the world.	
She asked me if I would like to come.	
She gave him a tip, which I thought was unnecessary.	
She got out of the car and went into the shop.	
She said she had been there before.	
She went to Beijing to learn Chinese.	
That's Tom Cruise, isn't it?	
The agreement is between America, China and Japan.	
The classroom was redecorated last week.	
The new machines are being tested tomorrow morning.	
The sun rises in the east.	
Their flat isn't as big as Sarah's.	
There are far more people this week than last week.	
There are fewer  people this week than last week.	
They gave us a map, which helped us a lot	
They have little money so they can't go on holiday this year.	
He's going to finish the work on Friday.	
This course finishes in June.	
This is the first time I have been to Switzerland.	
This one isn't nearly as big as the one we had before.	
When I was a child I didn't want to go to school.	
You did remember to lock the door, I suppose.	
You have been here before, haven't you?	
You're going to the party, aren't you?	
You're Margaret, aren't you?