Look at those dark clouds, it is possibly to rain. Sửa thành: Look at those dark clouds, it is possible to rain. (hoặc: it is possibly going to rain)
Lan is looking forward to return to her country after finishing four-year university in America. Sửa thành: Lan is looking forward to returning to her country after finishing a four-year university in America.
They were entirely confident that everything will go as planned. Sửa thành: They were entirely confident that everything would go as planned.
In the peak season, you are advisable booking your accommodation in advance. Sửa thành: In the peak season, it is advisable to book your accommodation in advance.
It is necessary for you to clean the floor as our mother has done it already. Không có lỗi sai.
We only have 5 minutes left, Peter. There's no need dressing up. Sửa thành: We only have 5 minutes left, Peter. There's no need to dress up.
Tome made a bad mistake at work, but his boss didn't fire him. He is happy about having been given a second chance. Sửa thành: Tom made a bad mistake at work, but his boss didn't fire him. He is happy about being given a second chance.
It is his attitude towards other people who really annoys me. Sửa thành: It is his attitude towards other people that really annoys me.

Look at those dark clouds, it is possibly to rain. Sửa thành: Look at those dark clouds, it is possible to rain. (hoặc: it is possibly going to rain)
Lan is looking forward to return to her country after finishing four-year university in America. Sửa thành: Lan is looking forward to returning to her country after finishing a four-year university in America.
They were entirely confident that everything will go as planned. Sửa thành: They were entirely confident that everything would go as planned.
In the peak season, you are advisable booking your accommodation in advance. Sửa thành: In the peak season, it is advisable to book your accommodation in advance.
It is necessary for you to clean the floor as our mother has done it already. Không có lỗi sai.
We only have 5 minutes left, Peter. There's no need dressing up. Sửa thành: We only have 5 minutes left, Peter. There's no need to dress up.
Tome made a bad mistake at work, but his boss didn't fire him. He is happy about having been given a second chance. Sửa thành: Tom made a bad mistake at work, but his boss didn't fire him. He is happy about being given a second chance.
It is his attitude towards other people who really annoys me. Sửa thành: It is his attitude towards other people that really annoys me.